DSTV is obstructing the delivery of my viewing and forcing upgrade sales.

I have an old decoder and I keep on getting an E102-29 message "This decoder is a PVR. If you upgrade your subscription you will be able to enjoy all the PVR features available. Please phone your nearest Multichoice Call Centre or visit.....". I called and advised that I do not wish to upgrade or use the PVR features and to stop the pop up message which is obstructing my viewing pleasure. I was outrightly advised that unless I upgrade the message will keep on coming up. THIS IS A FORCED UPGRADE PURCHASE STRATETY. DSTV is preventing the enjoyment of the service that I am paying for by obstructing the visuals literally every few minutes. Surely this is not acceptable trading practice! Disgusting practice.