Hisense TV Repair

I bought a Hisense TV at one of the big retail stores in 2016/11/24. On the 9th May 2019 the same TV started to appear dark on the other side. I went back to the retail shop were I bought it and logged the service call. On the 17/05/2019 I received an sms from Hisense confirming that the repair completed : (reference number ********** 53). I followed up telephonically on the 21/05/2019 and another service call was created indicating that I should expect a call very soon from one of their service agents: (reference number ********** 36). I received another sms on the 27/05/2019 informing me that service call has been canceled : reference number ********** 36. On the 02/06/2019 I went back to the retail shop to lodge a complaint the Hisense agent took my details and confirmed to me that she will follow up with Hisense. To this date I still haven't received a call or an sms. This is the most bad service I have ever received.