Bad service

I took out a contract with multichoice on the 22 Dec 2022 for a explora they came to install it ever since they installed it its been giving me signal problems I called them they said I should take it to DSTV I did they said it's an installer problem not decoder I should call the installer cause it's still under warranty I called the installer now tells me I have to pay R450 where did the warranty go? They now can't help me I have to pay R540 for 24months for something that doesn't work am very disappointed in DSTV Multichoice my number is ***