5G No connection, no internet connection, poor network connection

I wish I had read these reviews first before I "upgraded" to rain 5G. I was contacted by an agent to try to solve the connection issues and it still failed. I was on their 4G Sim before and I had minimal issues. Their 5G network connection is super poor, basically none existent, constantly on "Connected without internet" and when it eventually connects the is still no internet. I have had it for a week (5G) and I have requested a cancelation via their app already, waiting to be contacted. I had no issues with rain 4G all I want at this point is to revert back to my 4G Sim option or for you guys to re-activate my previous 4G Sim asap. I am now sitting with no wifi and everything I do with it at home has now come to a stand still, my debit order came out today without any issues. So please provide me with the service I am paying for. Thanks.