I’m just surprised that he only offers this for an extra charge of €1.50 for the nonsense he does as a hoster provider.
This means that the memory limit that was read out cannot have been 256 at the beginning.
If you now say you have 64 MB, then this is also very little.
I actually have 256 at the start and I really use them to the full, because the page with all the plugins can run perfectly without the customer / user noticing any problems on the website.
What are you currently paying for your hosting package?
How do you get to this provider?