Question about harsh ban

I just came back online after being banned for 7 days, but I had no idea why, and couldn't ask any questions while I was banned.

I was responding to a post to sell an article posting service, and I posted something like "I am interested. Please PM me the details and include a link to this thread."

The only infraction I could find was that this may be considered "bumping", however it was not my thread and I would have nothing to gain by "bumping. I just wanted more info about an offer.

Prior to this ban, this would be the typical way I would inquire about a service. This seems like it is no longer acceptable. Before I make any more posts, could a moderator please confirm if a post of this type would cause a ban, and if so, what sort of post would be acceptable to find more information?

With respect, I think a warning would have been more appropriate than a 7 day total ban. I appreciate your reply. Thank you,

 

In addition, when responding to someone's thread, you may not post in the thread to "send more information", "PM me the details", "PM sent", or anything similar.

http://forums.digitalpoint.com/announcement.php?f=58

 

Your answers about bumping threads can be found in this thread:
http://forums.digitalpoint.com/showthread.php?t=757045

The thread is already a stickie, and the rules about "not bumping" have been forum policy for a long time, so we don't believe it necessary to warn or remind members of clearly posted policies. Thanks.