No response to billing query

After waiting 36 minutes on your call line I hung up. I also went into one of your stores where they were also unable to help me. <br> <br> I have a top-up account that I have had for over a year now. My monthly bill is always the same and if I run out of data or airtime, I top up using the *141*10# system. The money comes directly off my account.<br> <br> The last 3 months I have noticed a line item appearing on my bill and growing in amount. The line item is called \Packet Switched Data Calls". The amounts have been the following:<br> All previous bills and Feb - Doesn't show<br> March: R9.35<br> April: R193.27<br> May: R501.10<br> <br> The guy in store says I need to lodge a formal complaint to get this sorted. Please advise. I need this sorted urgently as I am being debited for amounts I DON'T OWE!!! and nobody responds to mails and the store guys wont help.<br> """