Smart 3D tv

We purchase a LG smart 3D from Markro ottery and were assured it was a very good purchase and that after sales service was available. 5 and a half moths out of warranty the unit began to flicker and I contacted the store thinking they would help as we found it was a common issue with the model and was given the run around . On Saturday 11 isNovember 2017 I decided to take it into LG and found their service department closed. I then opted to go to Makro as we could not afford to sit with a R8500 ornament. The unit was booked in and I was given a slip to sign. On Monday 13 November 2017 I receive a call from Makro saying I need to pay a R250 courier charge and a further assessment fee which I was not made aware of when it was taken in. The papers I signed only states that I would need to pay if the defect is due to damage on my part. Makro should not sell items with defects as we found out on all the forums on the TV model. The unit now sits with the store and I don't even know what the want to charge for the repair which I would have to pcall was told In the same call