Make sure you dont let them ignore you. I did have the "pleasure" of communicating with 1and1 in the past.
First I was connected to Ruchika, who got lost as soon as I mentioned a CRON job and directed me to Markashi from the technical department. Markashi tried to persuade me for 10 minutes that this is a problem with my script. When I insisted that this is not a problem with the script he connected me with Phil, who fixed the problem with their server after 5 minutes and apologized...
I tried to use 1&1 for a side project a few years ago, where the DNS was being hosted on another server and not using theirs. They have a stupid script that checks DNS and assumes that you're using theirs, and it actually DELETES YOUR SITE after 30 days if their DNS servers are not the primary for the entire domain name!!! The Asia-based support folks are not permitted to speak directly with the German developers, so their promise that it wouldn't happen again lasted another 30 days until the site was wiped a second time. Since I had to restore from backup copies that I thoughtfully kept on my own computers, I decided to restore the site on another hosting company's system and dump 1&1. (I am happy with InMotion hosting after three years now, BTW.)
If you think the 1&1 saga ends there, you're mistaken. I contacted customer support with 24 days left on my pre-paid quarterly plan, and told them that I was disconnecting due to their system repeatedly deleting my web site. 21 Days later, my credit card on their account was charged for another quarter of service! Customer support issued a refund, and promised that it wouldn't happen again. Needles to say, they didn't keep that promise, either. The only way that I could get away from them was to login to the customer control panel (that they also didn't shut off my access to) and change the credit card expiration date they were using so that the transactions failed.
Long story short, I would not use 1&1 to host a web site if they were the last hosting company on the face of the Earth.....