Disconnected wifi

I have had the same problem monthly with supersonic, I receive a message informing me of my data usage, and immediately after, my wifi gets disconnected, when I still have rool over data, and more than 50% of my cap available, I then have to buy data on my phone, to contact my place of work and remote in, then spend an hour and a half on your call center line trying to get through to them, which when I do, they cannot correct the problem, this happened 3 times last week, and now aswell. I am spending extra money trying to contact your'll every month, and also losing work hours. This needs to be corrected immediately. I currently have 50GB of data, but your system shows I have 0GB and - 17GB used, how is that even possible. Contact me urgently please and correct this damn problem once and for all.