Out to get your money

I am currently living abroad but left SA while my Telkom contact was still active as it included my phone which was not fully paid for at the time. When the final payment for the phone was complete, I attempted to cancel the contract. Telkom makes sure this is impossible. Not only do they not have a way to contact them from outside the country, the will not allow any representatives to cancel on your behalf even if you have a matter and ID copy. They are happily billing me month after month, for airtime bundles I cannot even use! This is ridiculous!!