Poor service delivery

I am a new customer since February 2022. Connection was fine up until about a month ago when I kept loosing connection. I have been struggling since then. I have contacted them several times and they do a thing or here there , but connection issues keeps going. This past week I called again as my work requires me to have a fast and stable connection. I was asked to log into my router , but the support agent got stuck and could not direct me further what to. Her manager was not better either and I am still experiencing connection issues. I think they do false advertising to boost sales and is quite fast to sell you the router, but their after sales and support system sucks big time.