808 number not getting through

Since January this year I have been trying to cancel my contract since is was about to expire in February because I was told when I bought my iPad that I should notify them 30 before.that I tried to do at one of their outlets in Polokwane Biccard street at checkers mall and failed because when they dialed to their call centre it kept on cutting several times.one lady there informed me that when I'm at home I can take out my SIM card and insert it my cell and call 808, still did not get through.I went to the same outlet again and i told them 808 number is not working they tried to call still did not get through.I then went to other outlets mall of the north, and savannah same thing happen. Now I am based in bela bela , went to bela bela mall twice same thing happened until a gentle man there told me that when I go home I can go to MTN in thabo Mbeki PLK they can cancel it for me which i fail to understand why those 3 outlets failed to tell me that.dialed 1023 was given their number, was informed that a request was sent to have my contract cancelled by one of the consultants there.that I did 30 days back even now it is not cancelled. This is not the right way to retain clients.