Deal with the immediate situation first and communicate before you have a solution. A customer told on day one that there is a supply problem and you are working on it reacts considerably better than one told on day ten when the delivery date passes. The instinct is to wait until you can offer a resolution, and that instinct costs you the goodwill that would have made the resolution acceptable.
Establish what actually happened rather than accepting the first explanation, because the response depends on whether this is a one off or a pattern. A single late shipment from a reliable supplier is an event. A supplier who has now missed three times, or whose communication has deteriorated, is telling you something about their situation, and businesses in difficulty rarely announce it.
Understand your position before escalating. What does the agreement say about delivery, remedies, and termination? Many small business supply arrangements have no written terms at all, which means your position is commercial rather than contractual and the conversation should be pitched accordingly.
Quantify the cost to you, including the customer commitments affected and any expedited shipping or substitution you had to arrange. A supplier who values the relationship will frequently share that cost when it is presented as a specific number rather than as general frustration, and asking is more often successful than people expect.
Then reduce the dependency, which is the actual lesson rather than the individual failure. Identify an alternative for anything where a single supplier could stop your business, place a small order with them so the relationship exists rather than being theoretical, and understand their lead times before you need them urgently.
Hold slightly more stock of anything with a long lead time or a single source, accepting that this ties up cash. That is a deliberate trade rather than poor inventory practice: the buffer costs money and it prevents the failure that costs considerably more.
Watch the warning signs, since suppliers rarely fail without indication. Slower responses, changes in payment terms requested, staff turnover at your contact point, and lead times quietly extending are all visible before a genuine failure and are easy to dismiss individually.
Then decide whether to continue deliberately rather than by inertia. A supplier who failed once, communicated well, and made it right is frequently worth keeping. One who failed, avoided contact, and offered nothing has shown you how the next occasion will go, and the relationship is worth ending while you have the alternative in place rather than during the next crisis.
Document the failure in writing at the time, briefly, since a record of dates and what was promised is what supports any later conversation about compensation or termination. Reconstructing a sequence of phone calls months afterward is neither accurate nor persuasive.
Tell your customers what you are doing rather than only that there is a delay, because a business that has already arranged an alternative reads as competent while one that reports a problem reads as stuck. The information is the same and the framing determines how it lands.
Check whether the failure was actually theirs, since ordering late, changing a specification, or an unclear purchase order all produce the same outcome from your side. Establishing that honestly determines whether the conversation is about their performance or your process.
Keep the relationship civil regardless of the outcome, since supply markets are smaller than they appear and the person you dealt with will surface again elsewhere. A business that ends an arrangement professionally retains options that one which ended it angrily does not.