Well the good news is that the Hub stats you have given are just fine, the bad news is that the BQM graph is showing a classic case of congestion (usually it's an upstream problem, for reasons that we don't need to bother about now). The cause is simply too many users or too much traffic for the local network segment to handle and a consequence of how cable broadband connection technology works.
The connection isn't actually broken, it's working exactly how it is designed to, think of the connection like a road, if there are too many cars using it, your commute is going to be miserable, but the road isn't broken, it can't be helped by resurfacing the road or getting faster cars, you simply need more road! Unfortunately for an internet connection, increasing the road size (capacity) is neither a cheap or quick process.
Now VM do invest and increase capacity in their systems but not as quickly as everyone might like, hopefully in a few days one of the VM forum team will find this thread, and check what the status is with your connection and advise if any remedial work is planned and the time frame for it - but, be warned, these estimates can very often slip and you could be looking at many months before anything happens.
In their defence, VM never make any claims about latency and would certainly never advertise a product as being ideal and perfect for professional streamers - especially not a domestic internet connection with no guarantees or SLAs attached.
Not that any of this particularly helps you right here and now, so what I would suggest is that you a) continue to call VM and complain about the poor quality of the connection making if difficult to play games, remote working etc. - don't say anything about losing money over it as that won't cut any ice as explained above, and b) at least start investigating alternative internet suppliers. Yes you won't get as good headline speeds but what's more important, speed or consistency of the connection?
Armed with all that, see what VM have to say about it when they reply and you can make your decision accordingly. Personally, in your shoes, I wouldn't be relying on any one provider. It might well pay you to keep VM for the raw speed and an alternative supplier as a backup and for the lower latency.