Edelweiss Financial Services — Uploaded wrong person sign against my Demat account

While opening my Demat account, Edelweiss swapped my sign with other person of same name. They even don't have courtesy to cross verify my sign with PAN details they already bought with acc opening form. Now due to these I can't sell my shares as my POA(Power of Attorney)sign doesn't match with sign on account opening form. Though I have emailed them immediately after they sent me copy of acc opening form about their grave mistake but nothing is done yet from there side.