Collections call, for an up to date account

In a week I receive about 4 calls from people saying they are calling from African Bank. I have a credit card with African back, I have never missed a payment up to this day my account is Up to date( Payments, contact details and Personal details ). These call consultants call me claiming that they want y Social Security Number(IID no) to update their system Every Singe time they call!!. On the First someone called me again saying they are from collections but my account is up to date. Advise do not ever open an African bank Account it will be an Identity Risk.