Citibank Consumer Loan Complaint

Citibank Consumer Loan department,

Vehicle loan Managing the loan or lease Pennsylvania

In - I took out a car loan with Citibank which put a lien on my title. Down the road they sold the loan to - bank. In - I made my final payment to them but never received a lien release. I contacted Citibank several times, but they were of no help. So where do I go from here ... .Any help that you give me would greatly appreciated.