@akbardxb Am really sorry to read this feedback and the pain you have been through. Can you confirm the BLS office you have been to ?
I had a similar situation at BLS Brampton with Appointment on Apr 6th 2022 did SC without Canadian PP. I did some homework on this forum and did understand from the BLS checklist
https://www.blsindia-canada.com/toronto-jurisdiction/surrender-of-india-citizenship.php that I need to submit a declaration that I have not applied for Canadian PP at the time of SC application. So I drafted a letter myself and submitted the same along with my application.
They did not accept my photographs giving some lame reasons so I had to redo it there by paying $15 more.
There were a few errors on my application like dates of passport expiry and names etc. the person at the counter informed me that I need to fill up a new application and come back by 1:30 PM and they will accept my application
I went back filled a new application and returned before 1:30 PM I was let in directly by the guard, they accepted my letter of explanation regarding Canadian PP. They did try to sell their postal service, I politely refused and said I will pick up to which they did not say anything.
Tracker updated on 11 May that SC was ready for pickup I came around 2:45 PM and left by 3:40 PM with all the docs.
pick up time is limited so since you are a large group, they may not let all of you in at the same time and your will have to come individually one day each to pick up your cancelled passports
As far as I know 1 person can do a pick-up for entire family as they would only allow one person inside during pick-up hours.
My advise is do not tell on the phone that you want to walk-in without appointment they will only try to sell the postal service. I was in the same situation and I dodged their question by telling that I have an appointment and the person on the phone was quiet.
I cannot vouch for the appointments mix up as mine was a Single applicant submission
Good Luck