Remove my cellphone from your database

Hi

I have called mbd attorneys on behalf of my grandmother to enquire about her account and how she goes about in paying her installments.. which now I don't know who saved my number on her account cause now they keep calling me even morning looking for her and sending me text messages on my work phone.. And each time I keep on telling them that this is not her number I was just calling on her behalf and they must remove my number but each time I do so seems like it's the more they call and I am sick of it cause worse I don't live with her ..

Can someone PLEASE help me remove my number from your database.