Poor customer service

Mtn recently amended their data package times without communication. When I questioned this I was informed by their communication team (Facebook) that the following amendments would not affect my account and that this only related to prepaid customers. After checking and realizing that this was not the case and addressing this with mtn, they promised they would fix this. I have been messaging weekly since the 19 December 2019 as they fail to give an update as well as attend to my query. Mtn is all honesty a definition of poor customer service.