Worst service provider

The worst service provider experience that I have ever received and they dont even deserve a single rating. On the 22 May I upgraded one of my lines to unlimited data and the consultant decided to take a once payment for the devices instead of allowing them to carry on a monthly payment. Eversince there has been 8 cases that have been opened to try and resolve this matter and now three of my other lines are now suspended. Their chats are useless Mdu told me that I have to wait my case is not the only one they're busy with