Overcharged

When Nashua Mobile ceded my account to Autopage Cellular I was made to understand that nothing would change. However, when I received my first statement from Autopage I noticed that I was billed R528.00 instead of R458.00 which was my norma bil eith Nashua Mobile. No explanation was provided on the statement. I phoned Autopage to enquire about this anomaly and spoke to N Ntsoanyana who requested that I email her my Nashua and Autopage statements for her to investigate. This happened on the 8th of December 2014. Three emails later and she stii has not bothered to get back to me despite having read the emails.