Slow Internet Speed & Range Extender

I have a 100meg line with Level 7. I am running speed test and getting 90meg but can't even do WhatsApp Video calls, Tiktok or Facebook as it is buffering. My 10meg Satelite wifi was faster than my 100meg Fibre line. When calling Level 7 I was told they switched my Ports and also that my secondary router (Range Extender) is not picked up by them. They are now trying to blame me as Customer for something that has not been correct since the beginging. Advising that we as Customers did a reset and of course throwing the Call Out fee in our face.

This is not the first time that I have issues with Level 7. Definetly not my first choice for Internet (Fibre) service.