Vodacom email issue and acc increased NO REFUND

Vodacom has frustrated me in trying to change my contract - worse they took months to tell me that the email system has stopped sending me emails as my email address is only two letters and the system wont send email to these addresses - kept being R18 or R100 in arrears and never received accounts in the last year after 27 years as client. CRAXY THEY CANT SEND EMAIL to *** - imagine that. Then in the time of trying to get the account sorted and email and upgrade change to red package they started charging me R500 per month more as some discount promotion on contract was only for 24 months. I thought it was a discount because I hadn't taken a handset - now they wont refund or credit my account the outstanding amount and says it is my problem. NOT HAPPY!