Unanswered querie on Data usage

<p>Since 6 December 2016 my phone are being re routed to a recorded an*****ment when phoning customer services the first time they informed me it is an error on their system and the line were unlocked. Two days later it happened again and the call centre agent informed me that I exceeded my credit limit and have a data account in excess of R22000. I immediately asked them to investigate as it is impossible for me to have used that amount of data. The call were logged and said that the relevant department will come back to me within 6 hours. I did not hear anything from them up to now and still have a phone that is being locked every day. When phoning the call centre they just reckon should be patient as someone will return my call however this is causing imvonveniance and with security being an issue having trouble to be in contact with my family</p>