Feeling ****** of my right due to poor service.

I Nomthandazo Sithole took a contract phone @ Maponya telkom mobile in April 2014 in June I found out my ex boyfriend went back to the store told them I said he must take a second contract under my name Nwabisa a sales lady @ Maponya gave him the second contract, which I've been fighting for it to be cancelled in my name ever since June 2014.end of feb 2015 I received a miss call with a message that I owe telkom R4175, I made means to try an find out what was that for, the manager Vasco told me the contract was cancelled and they cancel them both I must pay R4175. Why is it that I must suffer for their mistake because the fact that they cancelled the second contract proves with no reasonable doubt that it their poor service that got me into this mess in the first place. Well I don't have R4175 because the reason why I took a contract was I could only afford to pay R250 per month which during their process of trying to cancel the second contract I was told not to pay because the accounts are linked now they expect me to pay R4175 which I really don't have, they must open my contract an I'm happy to pay the 250 per month that we agreed on.This is poor service and horrible attitude.