MBD Credit Solution

MBD Credit Solutions call me about 6 times a day from different numbers. They want my date of birth before they will tell me why. I will not give personal details over phone due to being ****med before. My bank account was cleaned out and to this day ABSA ***** is of no help. I asked to speak to a manager, this person was so arrogant and told me they will call me as often as they want and load the account with every call. How am I suppose to deal with it?