Low speeds without any explanation or action from Crisp

My ISP is Crisp fibre, I have been I am experiencing consistently low internet speeds, significantly below the speeds promised in my service plan. I have tested the connection at close range (3 meters from the router) and across different connection types. Most of my devices only support 2.4GHz Wi-Fi, and switching to 5GHz is not a viable solution. I mentioned this because Kyle informed me that it is a fact that I experience low speeds because I am connecting on 2.4Ghz and not 5Ghz. What he doesn't realize is that I am testing next to the router and should not have any effect. For the first year the speeds are on average very good, but not close to what I pay for, but acceptable.

I have started logging speed test results to document the issue. I will continue to record these results.

I kindly request that you escalate this issue and perform a full diagnostic on my line and equipment. If this issue persists, I may need to escalate it to the relevant consumer protection authorities.

I appreciate your prompt attention to this matter. Up till now you ignore my email I sent, and have yet to answer my email. I logged calls and received tickets, just to be closed again. This is unprofessional.