Worst service provider

I really have no idea where to start, I had very slow Internet connection and my router was swapped out from the oppo to a hawauei 5g 2 wks back since then I have had even worse connection very slow such that I am unable to login as I work from home. I have reported and have been buying prepaid data and using my cell fone to connect for 2 wks waiting for someone from Rain technical to call me and sort out the issue. I have run out of data on my fone and have logged in at work with no connection. Can I have someone assist or just confirm that I need to get a different service provider seemingly you guys are really fails I mean 3 wks to swap out a router and u seem to have given me a broken gadget as I'm having worse issues even after moving it around