bad bad bad service

My tablet didn't want to charge I took it to telkom they fix it after a while the same problem occur I took it to telkom again they send it away to the repair centre the repair centre phone me and said the invoice is R832 to do the repairs they send me a sms but some of the info was missing so I couldn't do the payment I phone telkom the lady said she gonna forward the sms again up until now she didn't send it again when I phone now they say the sold my tablet for R832 to pay for the repairs I did pay every month the payment but got now benefit of the tablet now they say I must continue to pay up until the contract expire