FNB Online transaction using Card declines for any online merchants

FNB declines online transactions done using my card and said its not allowed on my card. I visited there branch, contacted there customer support through online chat, called there customer service helpline but none of them were able to resolve the issue. The branch and online chat helpline says they wont be able to help and i need to call the Customer helpline online banking desk. Online banking desk says everything is fine with my profile and limits and forwarded the call to another department. Even they couldn't find any issue with my card/ account/ profile and forwarded call to ***** department to check if any restriction is there in my card for online transaction. Even they coudn't find anything None of the department knows where is the issue and just keeps passing the call to others. Wasted more than an hour without any resolution. I am not sure how do you solve issues if you don't want to take ownership of the problem. I want to transact on this card and you are saying I cant and none of the departments cant even figure out why.