Unacceptable customer service ,billing service

I signed up with Edge gym for a year contract,the agreement was that they would deduct via debit order on the 28th of each month,in the first month they deducted on the 15th,which I had to go and reverse,then at the end of the month they had still not deducted,then I had to go and draw the money and pay by hand,the following two months after that the debit order did still not go off and each time I had to go and physically draw the money whereas I had to pay the extra bank chargers and suffer the inconvenience, edge gym could not verify the reason as to why the debit order doesn't go off.hence I decided to cancel the contract,they then requested me to pay a R2500 cancellation fee,which I rep**** that i should not be liable for this cancellation fee as the fault lies with them,they did not reply,I contacted the head office in Cape Town and they said they would look into the matter and yet I have received no reply,this is poor customer service and I am not being treated as an asset instead they are just wanting money from me.please help!