Connection speed issues with worst customer service

I was upgraded to 1Gbps fibre connection and on 21 April 2023 they installed a Nokia Beacon 2 router to support this connection speed. On 22 April 2023 I raised my first ticket in regards with my internet speed. I was getting between 193Mbps and 377Mbps. This ticket was subsequently closed on 9 May 2023 without any resolution. I raised another ticket on 29 June 2023 to address the same issue. Once again, this ticket was closed without any communication or resolution on 2 July 2023. On 20 July 2023 I raised the third ticket, and this ticket was once again closed without any resolution or communication to me on 25 July. I raised yet another ticket on 25 July 2023 with the exact same issues and this is still open with a whole bunch of sub tickets that have been closed, again without any resolution or communication. It is a constant struggle to get them to resolve the issue and since April 2023 I have been paying for a connection I am not even closely getting. Their customer service is non existing, and I have to initiate communication 99% of the time to get any sort of response.