issue with a US mega Retailer!

[kinver]

"We're Unable to Process Your Payment"
i use to pay carder 25% of the retail value to card a specific US based Mega Retailer. all was fine but i realized that these carders were getting more and more unreliable as time progressed. So, I opted to start carding myself. one of the carders i know for a fact use to use SSH tunnels to card so, i started from there.
I downloaded Bitvise and purchased my first ssh from hero zero and configured it in firefox and behold i was successful! i did about 8 or 9 orders and all of a sudden i started getting an error on the site "code 237" and "code 506" so i started doing some research and decided to try using an RDP. i am no professional but i thought i'd give it a go. so i downloaded a RDP client for MAC OSX "Cord" and bought some RDP's from UAS and tried. both times i tried it went through but after about 4 hours i got an email saying "We're Unable to Process Your Payment" i even tried running an SSH in the RDP and still same thing happens. I don't know how to get around it. Please help!!!
This is my set up and how i card (im no pro so please dont laugh)
RDP Clean
RDP and CC same state (i try to get same city but these days GOOD ccs are hard to come by)
cardholder name = drop name (although in the past i have used Drop name = Cardholder's name)
Billing = billing
Drop = shipping *i have used Billing = shipping already and was successful
real phone number is always fresh and matches the city and state of the RDP and CC
Email = yahoo and gmail
Any help will be appreciated ... i need to know if it is my set up causing this or is it bad cards. i doubt after doing 8-10 orders all cards can be bad but there is always that. I hope to get a serious response.
If any of you are serious carders and would like to work with me please message me also! cheers