No Response

I have in the past 2 weeks received 3 notifications from mweb threatening to throttle me because of my apparent unfair usage". I have sent messages both to their technical department email address which appeared on the letter as well as 3 queries through my mweb account page, the last being at the end of April - to date I have yet to receive any response from them. I am not denying my unusually high usage, I am probably not the only user incurring high data usage during this lockdown - all I want to know is what they deem to be fair usage and I will limit my data usage but if I do not know what my apparent uncapped limit is, how do I know how much is fair?