i keep receiving calls to my cellphone from a scam debt collector. 

They have called XXXX or XXXX times now. They imply they are debt collectors, but when asked who they are trying to collect for, the woman said we work for XXXX of clients, a nd started asking for my birth date. I told them I do not owe any outstanding debts and stop calling.I hung up. The calls sound like they come from a call center. The # used is XXXX.