Cancelation

I am so frustrated with the service!!! Trying to get out of a contract is nearly impossible. I have been trying to cancel a cellphone contract since March this year!!! I contacted the cancelations department who advised that I need to pay an outstanding amount before I can cancel. Paid the amount and canceled the contract. In April I started receiving invoices for a number that I carry no knowledge of and when I queried it, I apparently signed for the subscription of the second number on my previous upgrade. No one can provide me with a copy of this contract that I signed. Anyways as we are trying to buy a house I need this bad judgment to clear from my name so I paid the outstanding balance. I received an email confirming this cancelation and that the cancelation will take effect from the 30th of August 2021. Last night as I browsed through my mails to my surprise I received another invoice for the month of Sept on this second number that I was under the impression was canceled. I'm done I am beyond aggravated and need this sorted!!!