Originally Posted by WilcoRoger

2-4-1 is not "deeply discounted" - you pay the full rate for the first night and 0 for the second. That's why 2-4-1 is ONE eligible night (at least - I had some stays posting two eligible nights)

I've found the PC phone customer service to be much more effective than via e-mail. Except for one case they sorted out everything while on the phone. That one exception required me to send in an invoice copy by (e-)mail, and was sorted out in return e-mail. When I have some problems, I just call them.