Bad service

I cancelled my contract on the 27th of March 2026 but it was not cancelled so on the 1st of April I check my bill then I notice that I'm going to be debited on the contract that I cancelled so on the 8th I called and inquire so that lady tells me she is writing a letter to management so that i dont get debited guess what come the 15th I'm being debited today I called now they telling me that I never cancelled I'm like listen to the call I made on the 27th at 14:11pm they say they don't have the permission to listen to records and on the system they can only see the call I made on the 8th only what a nightmare now I told them I need my money back cause I can't pay for something I cancelled I'm not crazy I even told them to come fetch they router il use other service provider