Need answers ASAP

It is quite a shame and disappointment that I want again have to write a bad review about MTN.on the 28th of April I phoned them wanting to cancel my contract as I have lost my phone and got through to retention and they gave me a settlement amount,I was so happy that I transferred the money same time.i tried getting through them a day after to confirm and cancel with no luck for a week,ok fine I continued trying as I understood that with the Coronavirus maybe they were short staffed or whatever and finally I got through on the 5 ,the first 2 people I spoke too said they were putting me through to retentions and cancelled the call.even after that I kept on trying till I got through,spoke to the nice lady told me that they were gonna send me an OTP but here system was slow and guess what?she hung up too ,I got so furious but few seconds after that I got this message: Y'ello! Your contract is set to be cancelled on 05/07/2020. An MTN consultant will be in touch to confirm this with you, or you can call customer care on 135. Have a great day!”and a ray of hope came but guess what nobody called,tried phoning again with no luck until I got the 2nd message yesterday “ Y'ello! We've changed the cancellation date for your ******* MTN line to 05/11/2020. You'll be billed accordingly. Have a great day!”what! Bill who? And for what? How is this any of my fault!did I asked y’all not to call?did I asked y’all to drop all my calls?now you gonna bill me?honestly I wanted to take another contract with you but how?ehen this keeps on happening and I can’t even call your call center as that place is a total joke!