Earlier quoted context omitted.
Didn't he state his preference was for him to call the salesman back and the salesman insisted he be the one to call?
That's semantics about what happens, doesn't change the overall situation. Reword to "the salesman said he would call back and the customer didn't ask him not to but instead said it was fine".
It is so much better if this incident sets a standard for their company and the telemarketers are forced to validate each time irrespective of their past association with the callers.