Telkom bad service

I am experiencing a problem with Telkom with writing just a confirmation letter that I have settled my account.My contract increased for unexplained reasons from R56 to R234 and it went sky high to R1600 and odds and I have to settle it as I was listed on credit buro.On 20 July have settled account and till today there is no response from Telkom regarding receipts of funds.Their service is disgusting have called them more tha 10 times with no luck.I am still stucked my name is on buro,their credit department is failing to confirm receipt of funds