Account query for detailed billing

Good day<br> I have a cell phone contract with MTN and have had for many years. I recently upgraded my cell phone contract and queried data charges on my account. I was told that once your data is finished you will be charged extra, which will appear extra on your account. Therefore I made sure that I always had data loaded on my account so that didn't happen.<br> I then received my monthly account in April and was charged an extra R770.85 plus VAT and a further R461.28 plus VAT for May for such charges. I immediately queried MTN (by sending numerous emails) and just received the same generic response that it is 'Packet switch data calls that include ringtones and pictures'. I don't download anything. <br> I then phoned the call centre and was told that I will receive an email detailing the billing amount. Which I never received. Originally all I wanted was to find out what actually used up so much data. To keep my usage down. So I didn't pay my account, thinking MTN would phone me, which they never did. <br> Its now how many months later and I'm now being threatened with legal action for not paying.<br> I have been a good client for years and this is the thanks I get. Shocking<br> B Venter