I have been using P1 Wimax for more than a year, and after the one year contract finally ended, I decided to stop, due to economical reason - I have a kid, need to buy her diapers, formula milk when needed and somehow I want to use Celcom Instanet which is around RM50 per mth only.
My plan is 20GB @ RM99, which is okay, but I try not to bond with this fixed commitment so I can rearranged my financial things.
Anyway, the only way to terminate P1 if you are around Klang Valley is by going to their HQ in Petaling Jaya, bring along your P1 Modem and adaptor to their office.
That's all I can tell. Car park is okay, there are ample parking lots there so it will not be a problem at all.