Sometimes it takes a bit for the staff to respond; they're busy with a ton of PMs.
Also, your forum name is commonly used, so they might be sending to someone else. You might have to change your forum nickname to receive a PM correctly, but I'm not 100% certain. Maybe you should try PMing once more to another staff member. ^^ Good luck.
Ye' must keep in mind that the staff members are often quite busy and it will take a while for them to respond at times. I assure ye' that the messages are goin' through to them. It might just take a bit to get a response for the staff are human beings with mortal needs. They're not robots who will receive yer message(s) then respond immediately 24 hours a day, 7 days a week. Sometimes ye'll have to be a little patient. Patience is a virtue, ye' know.