1. Script was not sent after I paid
Then how are you using it?
2. Seller does not respond
I'm on Skype, ICQ and Email. How did you try to contact?
3. Seller does respond after you send hundred messages and his reply is of two words
See number 2.
4. Only 2 import module works and they are very slow.
What are your server specs? Every import tool works as I import from all daily.
5. Seller does not reply at all if I ask something about any help.
See number 2.
6. No proper documentation provided with the script.
There is documentation for every import tool.
http://www.tubeace.com/nav/documentation/