Wells Fargo Debt Collection Complaint

Wells Fargo Debt collection department,

Credit card Communication tactics Called after sent written cease of comm Tennessee

I was at work and the person never would identify himself and kept asking me to identify myself, and when I did, I informed him that I needed to know who I was speaking with, he got smart and said I told you who I was and stated - - from Wells Fargo. As I told him it was put in writing not to contact me and you should not be contacting me, he stated that he was calling in regards to collecting a debt, and I stated again that Wells Fargo and the collection agencies that they have hired know not to call and he acted like it did not apply to him and kept harassing me with conversation regarding a debt, I am at work and I hung up and submitted this complaint