Overbilled and ignored

I was informed in February by an MTN consultant that there was suspected irregularities on my MTN account, and that I must log an urgent call with the call center to have this rectified, which I did (***).<br> <br> I was subsequently billed extremely high for usage that I did not perform, and my usage patterns in the months previous and thereafter have never been so excessive, so it cannot be correct.<br> <br> Since logging my issue with the call center, I have not heard anything from MTN with regards to this irregularity.<br> <br> Please rectify this issue immediately and reimburse me for this mistake.