I am having a really similar problem and I probably need step by step newbie guidance.
I did not think I was so bad at this, but it seems maybe I am.
I don't mind dropping a few quid for a helpful answer as I have lost a bit more than a few quid it seems.

I sent some BTC from Coinbase on Thursday last week but with only an hour window.
They then made me wait 3 days, well I chose that as I did not have my passport on me.
Now the channel has timed out and they are just saying that they sent it so it's not their problem.

One this that may be causing the issue is that my Electrum wallet is saying not connected and has a red dot in the bottom right.

Any help would be greatly appreciated.

Thanks in advance.