Mnet cuts signal but still charges!

Mnet are currently crossing over from analog to digital decoders, which is a good move and understandable. Mnet are supposed to visit and install a new decoder for customers that are on the first package they brought out over 30 years ago (2 channels). Instead, they have cut the analog signal to the decoder, with no warning to the customer (no sms, phonecall) and are now claiming that there is a backlog to install the decoder and we must just wait our turn! So we keep paying fees for a service that is not being delivered - how can that be legal?! Surely this breaches the CPA rules? Come on Mnet, how hard would it have been to install the new decoder and THEN switch the signal?????