Poor service

My decoder is a year old. But for the last 2years my decoder according to multichoice there has been an interference with my viewing. It is so bad I had to buy a new decoder todate I still experiencing interference gone from access to the lower amount of R30. But still interference no signal. Staying in an old age home most of lines are connected to a dish. But I am the only one with a faulty decider. Some days I can view no problem. Some weekends I don't even get a channel. Tonight I have been rebooting my decoder for 2 hours not seeing any viewing. I am fedup with multichoice. I am feeling to smach the decoder to pieces and switch to openview. These call centre's really interfere with my viewing. I am very annoyed with Multichoice.