MTN Coastal Cellular

I took out a TopUp contract with MTN Coastal Cellular on 20 May 2015 and it was an INSTORE activation. The lady did not set the limit of the calls to R0 and I did not know that she had to - that is why I went instore in the first place. I am getting BIG accounts and they refuse the resolve the issue. Coastal Cellular said I was suppose to set the limit to R0 and it is not their responsibility. What to I do now? I went back today and they said that it is not their problem. <br> I specifically stated that I want a TopUp contract because I do not want any surprises at the end of the month.<br> <br> I want to MTN Coastal Cellular in Port Shepstone to acknowledge that it was their fault and that a credit must be passed on my account otherwise I will go legal to resolve this issue. <br> <br> I am not satisfied with their service!