packet data cost

Dear MTN<br> <br> I was a Nashua mobile customer for years and I was happy. Then Nashua sold us to you guys without providing us with an option. My billing headache happened when I was moved over to guys.<br> <br> My bill went from 600 roughly a month to 2500. When requesting an itemized billing it takes years to get it. For starters I don't understand why am I being charged 800 for calls when I receive airtime and thousands for packet data calls whilst my phone gets locked I have SMS to prove I received an SMS notifying me that I have reached my limit and my service has been suspended????<br> <br> To top it all I have ended services that I've never requested like basic data and fax, mobile originating SMS. Basic telephony,<br> <br> What is promo service fee?<br> All line identity restriction?<br> Promotion notification?<br> <br> I need to be refunded and this mess sorted out!!!!!! And please do not tell me about over usage when my phone got locked!!!<br> <br> <br> I expect a response<br>