If company uses Paygate I just wont buy from them

I am an avid online shopper using my credit card for purchases. In general, online shopping is easy and without hassle. Yet, I have now officially decided NOT to support ANY online store that uses Paygate as a payment platform. Paygate payments respond with a statement 'credit card blacklisted', which is impossible. The payment process does not provide any details for contacting Paygate to identify the possible problem. Each time I have to make phone calls to the online store and eventually do an EFT, after a rejected Paygate payment. I just wont do this anymore and wont make use of online stores that offer this payment option. EFT is a pain in the butt and a waste of my valuable time.