Hope it goes well. You might have a standard bill price but with add-ons that mention the discount. That’s how EE do it with me. Those random slowdowns sound really annoying, not sure I’d ever be able to put up with them lol. I was contemplating going 4G too, but the only fast provider in my area is EE and they’re much more expensive than 3 lol. I also took a look at 5G but the equipment is horrendously expensive. You can get the sim only unlimited for £36 or so a month though. btw, maybe too late but did you check hotukdeals and moneysavingexpert? Those are my go-tos before making any broadband decisions.
I have found an email saying what I bought so when I contact them later should be ok, and yeah the bill says £70 with a bunch of reductions/discounts, but only goes down to £29 whilst what I bought says £20 so we'll see. Don't feel like I've had as many of them recently, so maybe was just a phase hah, I had a quick look yeah, our plans in general have been massively changing recently, so the fact we may now be moving to the Netherlands and won't be able to take this with us changes things again!