unwanted benefits

Bad service + unrequested benefits<br> <br> I have recently realised that Sterns has been add accounts benefits on my account , when i called the contact centre i spoke to Ahmad who told me this has been incepted from 1999 and said i coulddn't have picked it up because they are not billing me every month - The same Ahmad refuse to give me the surname yet when i called the 1st thing they want is for me to verify . I've had this acc for +/- 17 years and i biliv they have been adding interest also on the same benefits of which i don't know what's the benefit - STERN must reversse all the monies that ive pd unknowlingly . I have not accepted any benefits with them .