Dear Ms. XXX,

Thanks so much for your decision to continue the hiring process with me.

I looked closely at the description of the XXX position and understood that the role implied duties of some other kind than I thought it did when I first read through it. Actually, I thought it was more of a customer services position.
So, unfortunately, I have to let you know that I've decided not to continue with your furtherthe interview process.

I'd like to apologize for wasting your time, and thanks again for offering me a chance of getting the above-mentioned job. I hope that my withdrawal would not affect my future applications for XXX's job
openings.

Yours Sincerely,