Yep, it was hard as hell. At first, I was trying to reach out Excise Islamabad but they didn't receive my call maybe because I was calling at 4-5pm.
Then next day I went to Excise Punjab website and saw there was a helpline number (0800 087 86). I call and then they told me that your car inspection can be done from Fareed Court or DHA excise but you have to confirm it from Islamabad Excise as well. They ask me to call on 1217 which is PTCL inquiry number and they gave me number 2 times and both number didn't exist lol.
So I went to Islamabad Excise again, and started calling at every number that was mention there. To my surprise they picked up the call since it was a landline number not helpline and told me that inspection will be held at Fareed Court not DHA.
Will update you guys soon.