Pay me back my money and close this account immediately

Hello peter Writing this letter with a very heavy heart.iv had a contract with Telkom for years my problem started when i lost my Tablet phone number+*** i phoned them 2018 to block the number as someone was still using the number and my bill kept going up.they did block it and i was still paying it without fail.then 2019 i decided let me cancel the contract as i didn't find a need for it anymore.i have called email with fail they were still billing me whats even worse now their billing amount kept changing evn this year again i did call them again and i was promise account will be solve to this day im still paying for an account iv closed 28 November i got a text from them with case number ***7 to this day no one has phoned but im still billed to my other suprise when they send me bills emai/statement the address os not mine.all i ask is for Telkom to pay me back my money and close this Account for good.