Pathetic Service!!

I have been on a prepaid top up landline for over 2years every month my account is debited and air time loaded to my account then suddenly for the month of August 2015 my airtime was not uploaded even though my account was debited. I've been phoning the call centre but get no assistance what so ever. they have been transferring me from pillar to post my calls have been dropped when I've asked to speak to the supervisor I was told there's no supervisor or the call gets transferred back to the starting options. I have even been on the line for over an hour I have many dispute numbers but with each call they tell me that no dispute has been logged I eventually took time off from work and went into the bluff branch where I was told the reason I did not have airtime is because my contract has expired Which I found strange because my contract was for 24 months and would've ended in October 2014 but I continued to receive airtime. The lady I spoke to was not helpful she kept referring me back to the call centre 10210. I then cancel the debit order as she said that I would have buy airtime but my acc was debited again. I really need help as it seems no one at Telkom can help me