TELKOM DOUBLE BILLING

My data contract was due for renewal or an upgrade. In June I was offered a new contract (double data) for only a few rands more. After a few months, this new deal was not put into effect. I was paying the new rate but data was not increased. I went to the store numerous times to cancel the contract but was given the run around everytime. September the Telkom monthly deal was 40+40 for R369. I went to the Telkom for them to change my contract( which after months was not activated!!!) to the monthly deal. I was told to cancel the old contract then I would get the monthly deal. That was September!!! I have contacted the Telkom service centre numerous times. I have gone to the Eikestad branch countless times. I have called the accounts department too. The issue is still not resolved AND THEY ARE CHARGING ME FOR BOTH CONTRACTS!!!!. I have all the reference numbers of my visits and people I dealt with. This sucks!!!! It is unfair!!! I am a student and being charged for the past 3 months for a contract that I cancelled many times!!!