LTE not working

I have been having speeds of less than 50Kbps on my LTE contract. Now I’m getting an error stating my data has been depleted (which is not accurate) or that my number is in the Telkom range (which it is). I need this resolved ASAP, or else Telkom is in breach of contract and I’ll cancel. I tried calling but after three different agents (all three extremely rude), I had no luck.