Home connect Fibre speed issues

I opened an account with HC and Boleng that installed my Fibre. First I was on the 20/2 pacakge which I was happy with. But I then decided I want much more speed and app**** for the 100/10 pacakge. I was quickly upgraded to it but since then I don't even get 40% of that download speeds and even worse sometimes. It's been pillar to post between boleng and Home-connect and after more than a week this problem is still not sorted out. I am at the point to just cancel everything. It apparently would have been escalated and fixed today, but guess what. My customer number is POLG005