Yes Bank — credit card service and support

Address:

Mumbai City, Maharashtra, 400075

Hello, i am repeatedly receiving the below msg
Dear cardmember, your request for the payment for tata power account 90*0*4*75 for rs 2486 through yes paynow facility has been processed.

I have already de-registered the biller from my account, still i am receiving the above msg. I tried calling customer support for the reason as mentioned before. I was asked my registered mobile number, (I shared it), and date of birth (I did not).
I refrain from sharing my date of birth as that is something personal and i don't wish to share each time i call, i said that and asked to ask any other question as other banks do, and if and only if i am calling from random number questions for verification is asked, also the question can be asked to change. Perhaps the customer support person repeatedly asked me the same question, and the discussion ended up.
I still raise a point where the question was why the bill payment is processed for the biller i have already de-registered and i don't deem the question of verification to be the date of birth fit to be asked by any one.
Pertaining to your adherence to the particular question of date of birth rather looking up for the sense of security and point of dispute i wish to discontinue your service
Regards
Dr. Manish