got three call within 5 mins but didn't answer

I get about 5 calls a day from this number... I don't answer and they don't leave a message.

SST Card solutions...also deeto...they called as I was typing the 1st message...

They keep calling me and I do not know who they are. When I call back they say they are SST and they want me to enter my credit card number or my ss number in the phone. I am not going to do that, because I am not sure who these people are although I have an account with SST, they have no reason to call me because I have never missed a payment, so I do not trust that it is them.

This SST card services trying to collect unpaid or late credit card payments.