Why is my debit card being declined? i have enough money?

i recently made an online purchase and canceled it and tried to order another item but i filled out the info many times and my transaction was declined many times, is the bank limiting me on my spending? i didnt even spend much ever since i opened this debit card! i recently added money to my debit card and the bank is closed for the holiday. if i visit the bank and tell them to not decline authorization to my online purchases, can they do that?