I wouldnt worry about it too much. I dealt with a supplier when I opened who wouldnt deliver to my shop unless I bought at wholesale levels ie pallets of! The other option was to drive to the back of beyond at two in the morning to
meet them, er, think not.

Not sure why they'd take your password away. I'd ring them and see why, wouldnt surprise me if one of your competitors vetoed them supplying you. My nearest competitor did this to me.