I cant pay for my stuff

I may be being a bit thick but i dont seem to be able to complete the payment for the items i want
I get right to the end of the payment section, put in my card details, it then sends me to a site which i put my password in ( it is the correct one ). Then it sends me back to the credit card page and i do it all again
What am i doing wrong, i cant get past this bit
Its as if they dont want my money
Cheers Andy[:@] [:@] [:@]

Same with me - last order I had to use payment on delivery - UPS arrived , I gave them a cheque (about 10 days ago) and yesterday they arrived back asking for cash !

But yeah - I get the same thing at the last order page.