[Resolved]  Mitashi — charging problem

Address:

Dharwad, Karnataka

I have purchased DVD player portable tfd 7609 SI No-0000311 on 8-10-11 from Harsha Electronic shop Hubli. I have charged the battery for 8 hrs as instructed. but it will not run even 15 minutes. I have returned the dvd player for service at where I purchased. till today there is no response from Mitashi. their service is very bad. Why they are not replacing the product?
Please help me.