They called me on the 13th of November 2024 to market their product, which we agreed upon

They called me on the 13th of November 2024 to market their product, which we agreed upon. They came to intaĺl the decoder o the 16th November & every thing went wrong since then. I can't watch anything or record on the 2 decoders any more. I called them from the 18th November to complain about the problem that I'm facing, they always tell me that they'll send a technician to come & fix the installation but to no avail up until now. They don't even call their customers, you're the one who must call them & they make you wait until your airtime gets finished.