I've had it!!

I'm done! Saw *****ulent transactions going through my credit card, rejected them on my phone and called ***** division straight away. That was on Saturday. Wednesday the one transaction appeared on my statement. Please explain how the transaction could go through after rejecting it and then reporting it??? I'm told no payment is held. Hm! But every other payment sits on hold until verified. They call me for the slightest odd looking payment!! Another bank is looking pretty good at this point. Is it perhaps a case of ***** division working sometimes and at other times they just take a break???