Unhappy customer

My contract ended 1st of December which I made sure that I cancel a month before which was on the 30th of October via Telkom App, mid November I went to telkom store to check if my cancelation reflects I was told it did on their system, 1st week of December I went back to the store "Westgate mall" to check if they canceled it only to find that it was not canceled, the consultant at the store reassured me that my contract will be terminated within the next coming days but to my surprise I got the statement which states that there is a payment that I need to pay for their services for the month of January and also got the data which I requested to be canceled, I tried several times to contact telkom call center with no luck, they just give a whatsApp number then line cut which is just useless for someone like me who has a query. Telkom fix your mess I can't afford to pay for something I requested to be terminated.