Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: Somewhat minor , but it really bothered me . I was at the checkout lane at my local grocery store when my debit card got declined . Not insufficient funds , not incorrect PIN , just ... declined . With no explanation .

Question: What will they need to do next ?
Call their bank
Contact the bank for explanation.