"long time listener, first time caller..."

I recently got a Citibank AAdvantage Mastercard and signed up for some AT&T services to get more miles. Both companies manged to disregard my provided AAdvantage number and opened up two new AAdvantage accounts. I emailed AA Customer Service and asked them to merge the accounts. They responded and said they would, but I'm wondering if I need to contact AT&T and Citibank to update my AAdvantage number. Does merging accounts take care of this?

Thanks!