Day 11 and I`m still waiting to get connection

Day 11 and I still don`t have a functioning internet connection. The technician came over to mount the router on Wednesday however connection was not good in any viable position of the router, so he suggested that I try a 4G sim card instead of the current 5G sim that I currently have as there are many more 4G towers in a smaller range of my apartment. I have the router so all I need is the sim card. I sent an email straight away to support to downgrade me to a 4G contract and send me a new 4G sim to try and hopefully solve the connection issue and I`m still waiting for the courtesy of a reply.

Shocking service!