Bad customer services and incompetence

I have advised cell c to assist with cancelling my contract in January 2021 I was told I’ll pay for the last time not in March due to late request and they need to follow 30 days notice, when I called last week to confirm the process of my contract being cancelled I was told no cancellation was done ,I have required them to assist with an immediate cancellation and for them to investigate but still no assistance was offered to me instead of communicating with me I call all the time to ask for urgent solution.