Awful customer service

I phoned the gym on 29/06 to request that my membership be frozen due to a medical condition.After putting me on hold for a few minutes, the consultant confirmed that this could be done,all I needed was to bring in a doctor's note indicating I could not exercise. When I brought the note to the gym I was practically accused of forging it because the handwriting used to write my name ( which was filled in by his secretary) was different from the rest of the note and the signature. Obviously I took exception to being accused of *****, and offered that the surgery email the gym directly... At which point the manager I have been dealing with says he wants a certificate and not a note...but cannot actually tell me what the differences is ( because there is no difference...a doctor's note is a colloquial term for doctor's certificate!). I cancelled the rest of my membership, paid the cancellation fee and they have lost a customer for good. Terrible customer service for a routine request