Poor service delivery

I have two decoders on my subscription with multi choice . When I activated the second package I wasn't happy with the channels on the bouquet and had it downgraded . For the past 3 weeks every week my first decoder gets disconnected with a error code saying I might be in arrears . Every time I call into the call centre They see the mistake on there system and all they do is reconnect me . I asked the agents to please fix the issue so that My decoder isn't disconnected every week . But to no avail.Right now my decoder is disconnected again for the forth time.My payments are up to date but to be treated in this manner is frustrating.