Telkom breach of contract

I have to admit that I am deeply disappointed in Telkom's client service. We have a LTE line which we used for 7 months without issues, until 3 weeks ago when they suspended our account, with no reason. Our billing has been up to date, so their is no issue on our side. This has been escalated and the time limit since long passed. We phoned again and was greeted with an agent who was no help at all, insistent on things that has no relevance to the issue at hand. The information he seeked was already before him and even when we mentioned the dire consequences of the situation, he continued to be rude and no help at all. So now we are paying for a service which we can't even use and Telkom has no interest in solving our situation at all, despite the serious legal consequences of this whole issue.