I've been using IONOS (formerly 1und1) for the last 20 years for all of my DNS and hosting needs and couldn't be happier. Their uptime, non-obtrusive policies, and customer support have all been top notch. Can't recommend enough.
As an example; I had a dedicated server that I was leasing that I wanted to upgrade, the sales tech noticed that the plan I was currently on had been retired/replaced and credited my account with difference of what I had payed vs the new payment tier which amounted to six months of billing on the upgraded server. You can't really put a price on that kind of honesty!
I read this as you having to contact them in order for them to credit you for overcharging you for a retired product when the replacement equivalent was priced lower.
Why didn't they proactively inform you that your service was retired and there was an alternative available?
It sounds like this must have been going on for a while to be worth 6 months of service in difference alone.
I left 1and1 close on 2 decades ago. If you consider this a story of good service, then I would suggest you try some other provider.
IONOS requires you to make a phone call to talk to their retention reps before you can cancel anything
1and1 would call my house trying to sell me shit.
Their extremely weird and annoying adverts in the UK have ensured I will never use any of their services.