Terrible, terrible customer service from Mondo

I was contacted on Black Friday by a Mondo sales agent who offered me a new contract which included 500 min, however each month they only credit me with 200. I have sent numerous emails as well as called in and told that this issue would be escalated but I never receive any feedback. When I phone in again they can see the previous escalations but still nothing happens. All they need to do is listen to a recording of the conversation, this would take less than 5 min. I have never dealt with such a poor customer service team.

I have called them so many times and I get told it will be escalated, but nothing happens, I have sent so many emails but they are ignored. Last agent I spoke to said "Wow, I don't even know how this happened, this is really bad!" but then his promise to resolve led to nothing. It is absolutely shocking!