Vodacom extremely weak customer service

Wanted to cancel contracts at end of term vodacom direct then contacted me and offered 2 y5 lites on special contracts we received the first the second would come a moth later my wife decided after a day that it is a underpowered phone we decided to send the device back eventually the device was picked up at my place of work it has now been more than 10 working days still the device does not show as returned the courier company is ram couriers i have now phoned the call centre so many times trying to find out what is going on that i have been blocked by vodacom telling me they are doing it to prevent ***** i have to say this is really really bad customer service how do i resolve this does vodacom even care about their customers? I have the way bill and also i have a photo of the package