HSBC Debt Collection Complaint

HSBC Debt collection department,

Credit card Improper contact or sharing of info Contacted me after I asked not to California

I have been trying to contact this collection agency for the past two weeks. They do not answer their phones neither answer e-mails. I just filed bankruptcy and I need to let them know my case number. Please help me to contact this collection agency. This agency is holding my debt from HSBC/- Credit Card. ( They have not tried to contact me, you just do n't have an option for my problem )