I have never had a good experience talking with their tech support and I've been using them for many years.......so while I'll keep my fingers crossed for you, I won't hold my breath.
In case you don't get someone there who can help, maybe this will help - go to your Control Panel, go to MySQL Administration, create a New Database. Use the information it gives you (db name, db user name, host name, password) and put that into the wp-config.php file and install a new version of WP to it. This will "create" the tables you need. Then go back to Conrol Panel, go to MySQL Administration, and click on phpMyAdmin for the OLD database. Click on the database name, then click on the tab that says "Export".
In the box right below the work export where you see all your tables listed choose ONLY those tables that pertain to the blog you're selling, and export them to a file. Click the little box that says "save as file" and save it to your computer.
Then go back to phpMyAdmin for your NEW database, click on the tab that says SQL and where it says "Or Location of the text file browse to that file you saved and click on "Go".
This should populate your new database with the data from the old one.....