Multi choice and multi choice installers

Since last year when we got the new explora ultra with the dish and new lnb and had it installed we have had non stop problems with signal or faulty cable. Every month for 10 full days we have some channels that we can not watch at all due to no signal. A new installer came last week and told us the person/s who came to install the ultra originally should have informed us due to is having duel view decoders that we need a bigger dish and a stronger or a different lbn to watch on both our decoders. But no no one said anything so why must we pay for full services if we can not watch any of our shows due to the incompetence of the staff at multi choice and the incompetant installers they provide.