Missing data and low speed

I called supersonic last week Tuesday, 24 nov 2020, to query my data usage. I have been using supersonic since July this year, every month i have had a roll over of data of aprox 50GB, at the beginning of nov i had roll over data from October with the new 100GB for the month of nov, that totalled aprox 148GB for the month, by 23 Nov i had only 17.77GB left. I only have my laptop connected to the router. I have an additional router with vodacom which i use for my phone and other devices. The only reason i got the supersonic router, is specifically for work, as i remote connect to my work pc 4 times a week. The speed aswell has been inconsistent, i took this contract on the basis that the speed would be above 10mbs, from wednesday 25 Nov i was using my vodacom router to remote my pc at work, it was a lower speed but worked better than supersonic, sometimes the speed with supersonic does not even exceed 800kbps. I constantly have to restart the router up to 30 times a day, is this contributing to my data being used up so quickly in nov. I work from home 4 times a week, tuesday to friday, as can also be seen and monitored, i use up to between 4 to 6 GB per day, in the month of nov sometimes 6 GB was used in and hour, which is impossible, i spoke to an agent and also advised them that no other devices are connected to the router, the laptop aswell as no updates downloading, i have been doing the same consistent work during the 4 days a week, so do not understand how the data could be used up. I have been monitoring with my vodacom router aswell, for the last week. For 10 hours of work i used 4GB wiyh vodacom, where as today, i have worked just 4 hours, and supersonic has used up 3GB of data already. I have kept the usage as proof. Please can i have assistance with this asap aswell as the low speed problems.