MISTAKEN IDENTITY x 2 !!

This has got to be the most *********** bunch of individuals I have ever had to deal with... I have been harassed on a monthly basis for most of this year by this crowd who are looking for payment on not one, but TWO, Virgin Active accounts that are NOT CONNECTED TO ME in any way, shape or form... I have - at my expense - contacted the MBD call centre about 5 or 6 times to get my number deleted from their system, and each time I get told that it's all sorted and I won't hear from them again. But, a few days later (and sometimes THE VERY SAME DAY), I get yet ANOTHER missed call or threatening SMS about these unpaid accounts! So - WHAT CAN BE DONE MBD, TO GET YOU OFF MY BACKS PERMANENTLY??!! I am NOT who you are looking for in either case here, and so your constant harassment is a total waste of your and my time!!