Poor Cutomer service

I have been paying a load for the last 5 or 6 years (not even a big amount). I want to settle the account, more than half an hour on the phone talking to numerous different people after I have asked more than once to talk to a manager, with no success. I only have a certain amount to settle the account, I just want someone to give the go ahead so that I can settle the amount within this week. Can a MANAGER please contact me as this is extremely poor service.