Corporation Bank — Cant operate any online transaction using debit card

Address:

Tamluk, Purba Medinipur,West Bengal

Respected sir,
I have savings account in the corporation Bank / union bank, bearing no.[protected]( corporation saral plus - public, Branch Tamluk, Purba Medinipur, West Bengal ) With the visa card allotted and activated ( expiry 02/2024).
But from the beginning i had only 1 successful online transaction using the card. After that till date no online transactions can be made, though i requested several times to the bank authorities to solve the matter. Plenty of balance is always maintained in my account, no inadequate amount is drawn till date.
Therefore, i request you to kindly take steps against the grievance of the bank, stated above.
Thank you
Sk Roquibul Alam