Migrate from ADSL to nothing !!

Telkom contacted me to find out if I would migrate from ADSL to Wireless. I was assured that wireless would be more stable and that all three my telephone extensions in my house would work on the wireless system. The migration took place and I have had nothing but problems since. Most of the time the wireless is not working and I now only have one telephone extension in my house. (when the service works) I have logged several calls (last reference 510CRZ150416) which are according to SMS' received from Telkom resolved but still no functioning system. I cannot phone or receive data on wireless. On top of this, I was now told that I would have to pay for a call out from Telkom?? PLEASE fix the wireless system and get all three my telephone extensions working again, Alternatively, migrate me back to ADSL - it was working just fine.