Rain Support is non-existent & clueless!!!!

I must admit, I was a happy customer... and with us moving back to level 4 and working from home, I decided to upgrade to 5G. I had my router delivered on Monday 05/07/2021 and today have not been able to connect! I manage a technical support team for an ISP and have set many of my family members up with this exact router and network. I've completed ALL the troubleshooting needed and tested another router as well as another SIM in my router. The router works perfectly! But the SIM does not pick up in ANY router. I've saved these guys 30-40mins by troubleshooting myself and JUST need a call to get my SIM sorted yet NO CALLBACK!

I've emailed multiple times, had auto-response, and eventually yesterday someone sends me settings that can ONLY work if the SIM is working!

I am now paying for the 4G service that I cannot cancel until the 5G is working and will be billed for my 5G service. COME ON GUYS, GET YOUR ACT TOGETHER... I cannot make this any easier to resolve!!!!