Answer:
Let me make a phone call, I’m sure we can get it worked out.
Explanation:
The call being made by the customer has nothing to do with our existing business relations, as a matter of fact, the customer seems to be giving me a favor by making a call and getting the work done which is a concern for me because there is a possibility that in the future the customer might use this situation as a bargaining chip and/or ask for a favor in return or special treatment. Even though he has been my loyal customer but in business environments Favors can highly influence parties involved.