Aditya Birla Money My Universe — Not able to nominee to my account

I am having Aditya Birla Money MyUniverse account. I applied for adding a nominee to my account via there process and send them form with my signature to their Head office twice at following location.

Aditya Birla Customer Services Limited
501, Cello Triumph,
I B Patel Road, Off W.E. Highway,
Goregaon (East), Mumbai - 400063


Both the time they replied me "My request to Add Nominee Request is rejected due to Signature Mismatch As Per KYC DOCS". I tired calling them to give me resolution of this, but I am not at all getting any response from them. They are not even able to give me the KYC form with which they are comparing.

They are making a fool like any thing. I tired calling them everyday since last one month, but still I have not get any resolution on this.