Unhappy customer poor service delivery

Received a Hisense tv from them. It worked for 10 days and then I placed a service call with Hisense as the system was faulty. Hisense visited my premises and confirmed that the back light is faulty and that the new unit must be replaced. Hisense informed me to give all the information to The Digital Experience Fourways as the was the suppier. I gave them the ticken number and requested them to reques a credit from Hisense. All this information was shared via email to them on the 7th of Feb. Followed up on the 8th 10th 14th 15th and a couple of calls but to date nothing has happened. Still without a set. I don't get any feedback and every time I call they said they will come back to me or Juan will call me. To date....not a word.