Bad Connectivity on my Router.

I have had connectivity problems since around 10 march 2020. I have reported the problem in April during the lockdown and I was given an invalid case number. When I followed up later than month I was told the case number is not valid. When I finally go the case number on 6 May 2020, they did their diagnostics with me and found that the connectivity is very bad. I was told I will get feedback from the technical department by 28 May 2020 but until today I have been making follow ups with no acceptable response. Case number: ***0