Skimming money

My Elderly husband was encouraged to take an internet package and gave all his details. The salesperson ended the phone call when my husband was going to check what the speed was etc. So he emailed Best Internet. He received a reply some time later saying he must contact Supersonic! He tried and the phone was not answered. The courier company arrived with the device and we refused it since we could not find out about the package. We reversed the first month payment and tried to contact them again. The phone eventually just goes dead. Now on the third month they have charged R798 instead of the R159 quoted and they still have not contacted me. This month they changed the account name to Supersonic I surmise so that Standard Bank would not block the payment. They remove requests to contact them from their facebook page but dont contact us at all. When we tried to email the address given us by Best Internet, a message to say that the email address is unmanned is received. Initially, we just wanted our questions answered before continuing, now we dont want anything to do with them, We were talking to Best Internet not Supersonic. This is a ****