Plot extra land charges category - DHA Islamabad

Could some experienced members please share how DHA Islamabad determine charges for extra land. I found this document which describes schedule of charges of each category a,b,c etc:

http://www.Dhai-r.Com.Pk/wp-content/uploads/2015/12/newcharges-13oct2011.Pdf

My question are:

  1. Can DHA declare any trapped area/odd shape as cat "A" at their own discretion?

  2. What are legal rights of a member if dha cannot satisfy an odd shape plot owner on their interpreted assertion of plot land category and rates formula?

  3. Is there any brother who can share his recent experience of paying extra land charges at DHA Islamabad?

Best regards

Any brother who can offer advice on handling this issue at DHA Phase 1 or 2 at Islamabad?