Horrible customer service

I purchased a phone and tablet last year sometime.. Which was done online.. 4 months later the tablet is not working, we were told to take it to any Vodacom store,which we did take it to bluff with the box etc so they have the serial number. A month later we a get call from a lady at the bluff store she said we must fetch the tablet.. I asked if it's sorted and fixed.. She rep**** I'm not sure I will call you back just now.. Her just now was 2 weeks later.. Asking me to fetch it again.. I asked is it fixed her reply was it can't be sorted coz they can't pick up the tablet on the system.. They say they need proof of payment.. I said it's on contact and surely you can pick it up from usinb the serial number. The lady at bluff named ****ha could not help me, she was not sure what was happening... If when I called she said she don't understand a term.. She will call me back. They did not even try to help and it's been over 2 months and no1 can pick up the tablet..