Day light ******* and pathetic customer service

I had a shocking and unexplainable usage of data when i was having a Teams Meeting last week Friday - an estimate of 8 gigs used up within an hour. I raised a query through customer service. On the first case the matter was closed without an explanation. On the second occassion the case was closed with an unsatisfactory explanation despite my disagreement with this and the consultant came across as arrogant and showed no intention to solve my matter. The case ref numbers are *** and *** respectively. In a time when the nation is trying to stay safe and work from home, obviously through the use of the internet this is unacceptable, worse still been bul**** to accept an unsatisfactory explanation is shocking - what happened to consumer rights or just plain good intention to keep a loyal customer happy