High-handed & dishonest

I have what I thought was a contract to view MNet, paid up till the middle of 2018. Last week after a storm the second channel developed a split picture. The aerial was checked and found to be fine. I then connected up my DSTV decoder and asked DSTV to switch me over to a DSTV bouquet (while I had my decoder checked at DSTV offices) Today I took my decoder and a friends (that was working) and asked that the two decoders be tested. I was told rather bluntly that my friends could no longer be transferred into my name and that mine was not working - just giving a snowy picture. This feedback on my decoder, in my opinion was untruthful, as when I last disconnected it it was working fine the main channel and partially on the second one. On calling the supervisor I was told that I could no longer switch back to MNet - there wasn't any contract between us for Mnet as we just paid into an account. With this"migrating to digital" they didn't have the facility any longer to connect me back as they had twice done in the past. I wasn't warned at any time that temporarily switching to DSTV would end my MNet service. There you are - a one-sided high-handed decision to end my MNet service.