receiving false sms's of overdue acc

on the 6th of august i paid my monthly instalment via EFT into the MTN account.I then sent my proof of payment to the MTN credit department after which MTN responded acknowledging that my proof was received and my line will be reactivated and the statement will be updated. a few days later i received numerous sms's and emails stating that my account is still overdue after i have sent my proof of payment (more than once) and after MTN acknowledged receipt.Today (28th August) i receive an SMS stating that i owe R470.40 (which i paid) and and the instalment for sep which adds up to R929.40. Failure to pay will result in account suspension.I've called 808 (held on for almost an hour) and sent emails to the email addresses made available for assistance and for a consultant to at least update my statement but i have received no assistance as they just keep on telling me my acc is overdue after i have made payment!!