Citibank Credit Card Complaint

Citibank Credit card department,

Closing/Cancelling account California

BestBuy offered me City Bank credit card i agreed and was approved. I received card and try to activate but it was impossible because they can not identify phone number as mine. So i can not close account or activate card because of their problem with identification of my phone number. I have all necessary documents, -, ID, and phone number contract is on my name.