Errors in billing

I received a bill in Dec 2015 for the amount of R287.65, i did not received a bill in Jan 2016 of in Feb 2016 on 25/03/2016 i received a new bill stateing i own R2459.00 i dont know for what?. i contact the 10210 number to inquirer how they get this amount as i am not living in pretoria anymore and i cancelled my lines on 22/02/2016 Ref ***2... Sikele was not help full at all even when i told her i cancelled everything at the branch in Mall @ Reds ( 3rd time they ***** things up for me) and have a ref number, she did not even took the ref number told me i need to go back and request cancellation again or she can e-mail me the forms... i already made an effort to go to pretoria to do the cancellation why must i do it again? in the mean time Telkom are billing me like mad for line rental after i did cancel it, according to Sikele there's nothing on her system... how on earth are this people doing business, i have a Telkom system ref number for my transaction??? They dont do nothing to correct error's on there side they just say \eish sorry ne...but you need to do it again......\""