Incorrect Billing of Data & Unauthorised Sim Swop

Since 30 May 2015, I have been unable to connect to my Wifi device. It displays \limited services"constantly. I called Vodacom customer services on Saturday 6 June 2015 to query my problem. The person in the call centre told me nothing was wrong on my account but I should take the device to a Vodacom store to check if it was faulty.<br> My son went to the Vodacom store in Cresta - he was informed that a sim swop was done on my account on 29 May 2015.I did not request a sim swop as had no reason to when device was working before 30 May. The only issues I had was that signal was not very good in our area"