Dstv Streaming, channels unavailable

We have a Dstv Premium streaming account. We struggle at least once a month with certain channels not being available, e.g. 144 or 145. Phoning Dstv is not helpful as they can only help you if you have a decoder. WhatsApp is even worse. All they keep on telling you is how to pay your account as if that is the only problem you might have. No messages to clients to inform you of issues that might be a problem and when it will be resolved. Where else do go to get this resolved?