Debit card — Show in invalid card

Address:

Yerraguntapalli village / chintalapudi mandal/ west godavari district

Respected Sir/madam,
I am account holder of canara bank from last 3/4 years. my debit card show message as invalid card. As per bank officials i used it after 3 days, I am unable to do transactions so kindly resolved my query as early as possible.