Sitemap error fixed, but resubmitting doesn't help

What to do to resubmitt again

[silverbytes]

My hosting bandwidth was exceeded. Page was unreachable some days now is back.

Tried to resubmit my sitemap but marked error.
So deleted the sitemap and tried adding a new sitemap again and I get this:

We couldn't find the Sitemap at the location you
provided. Please make sure the Sitemap URL is correct
and resubmit your Sitemap.

A similar thing happened with my other hosting company, there was a dos attack, server went down, now is back and submitted sitempas are now "HTTP Error"

HTTP error

The server returned an error when we tried to access the URL provided. Please make sure the Sitemap URL is correct and resubmit your Sitemap.

The thing is: they are working now all of them but neither resubmitting or trying to add the sitemap again (even renaming the xml file) works!

Robots txt is ok (all were crawled and working past week)

Is this all about time and tomorrow (hopefully) google will accept my resubmission

What do I do?