Problem with Creditor Interchange

Creditors Interchange have been call work place, work cell phone, They have been told 3 times not to call. Now they are calling work cell phone saying they are going to forcloseon our home what can we do all of our c.c. have been turned over the an agency and we are working with them. Infact Creditors Interchange have been told by us and the company to contact them and only them. What do we do . Email User