Malfunctional decoder and contact numbers not existing

My decoder doesn't have Apps Netflix, Showmax, People weather, Brixbox, Box office and Catchup. I contacted multichoice they tried to reinstall them or check from their side. The consultant told me that it's a technical problem. Went to the DSTV outlet still on app I was advised to contact On Air TV since I bought the decoder from them and it's insured by them. I have been calling all their numbers non of them are going through all their numbers do not exist I have been sending emails to them no reply still. Now am frustrated and angry I don't know what to do anymore