Telkom refuses me to cancel my contract

Good day, I have a contract with Telkom and now it is due for an upgrade and I do not want to carry on with it, I want to cancel it. For the past 2 weeks I have been trying the 180 and 181 numbers but all I get is the voice machine that tells me what website must I go to if I want to cancel my services. I have been to that website but every time I get an error message saying there was a problem to retrieve my information. I cannot access the platform where I can cancel my contract but everyday I get calls and emails telling me all the deals I can get for my upgrade. I was told by one of a sales person that called me yesterday that I should go to a shop to cancel my contract. I refuse to do that since I took my contract over the phone and I will not go and stand in those long ques at Telkom shops. telkom is ******** me because the more this contract stays open I will still have to pay for it and it will end up charging me not a discounted rate that I signed up for but a full package. This is a total rip-off, there should be a way that we can cancel our services online not this website that does not work.