Completely Dissatisfied with Shocking Service and Promises DSTV/Multichoice

As a Premier subscriber for as long as dstv has been available, I received a call where I was offered an upgrade to my decoder in order to view Showmax. This was sold promising installation, fixed monthly premium for 2 years and Showmax. Although no faults to the installers, I have had nothing but inefficient, shocking service from Dstv. It has been 3 months since installation after what must be close to 20 calls and numerous visits in person to their offices at N1 City and after promises after each call and visit was assured that my Showmax would now be working. This is completely untrue and to date I am unable sign in to Showmax. I am now beyond frustrated and annoyed with the empty promises and no solutions offered by Dstv. What is one to do now? As it is impossible to escalate beyond the local offices and the lack of interest shown in rectifying this unacceptable situation. Dstv is quick to offer but not deliver, this service is disgusting. It is shocking that Dstv are quick to take the monthly payment yet are not prepared to give one what is rightly their to access. I ask for help and advise on rectifying the situation as a matter of urgency. Help please!!!! Shelley Windell