There have been several instances (around 15 of them) where an invoice has been sent to an organisation claiming to come from 20i.com and stating that their domain name has expired or is about to expire.
The information relating to your domain name is available to view on the Nominet website: Registration Data Lookup by Nominet Just enter your domain name and other information will be presented.
Someone, or some group have been trawling through this data and identifying websites that are hosted by 20i.com. I have a reseller account at 20i.com and deal directly with them. You have no relationship with them. Invoices from 20i.com are not sent to you, they are sent to me, and I look after them for you. The people behind the scam do not know that.
If you receive anything about your website, or your domain name and you are not sure, send it to me and I will confirm whether it is a scam or not. It stands to reason that if you do not have a relationship with 20i.com then you would not expect to receive an invoice from them.
20i.com are aware that this is happening, no doubt other hosting companies are being targeted too.