Over Billed Account

My account was handed over by Planet fitness in 2013, In 2014 i was called by Saya to pay my account of R2 700.00. I did as of 31 March 2014 to date. I called Saya last week to ask for my statement. Weirdly the balance has doubled to R4 634.00. I cancelled the account in April 2014 and Saya are requesting a cancellation fee that i was not initially told about. And the fee will be charged on a certain percentage of the current balance. I called planet fitness to verity if my account was cancelled and if it was an on going contract, and they verified that on their side it is cancelled and there was no cancellation fee payable. Saya offered a 50% off the recent balance with a condition that i pay it as a once off fee. The statement i was forwarded state a different balance of R3 621.40, and the consultant refuse to send a statement of the R4 634.00 balance. He stated the difference is their charges. I also requested a reference number to my call and that was also refused to be given. Planet fitness stated my account expired and cancelled in April 2014 but the statement i was sent the was membership fee still being charged on 01 August 2014.