Scammed, Family Group Chat On Imessage

M 26. Met someone on Grindr. Not out as Bisexual to family and friends. Stupidly moved off platform and started texting. Sent one dickpick and one face pick. Started blackmailing me shortly after. Added family members to group chat and sent initial message saying they would expose someone as gay and send nudes. They found my info through searching my phone number, family too I guess. 10 people added to group chat, only 5 are confirmed family in my contacts, mom, aunts and uncles. After searching numbers online other 5 seem to be people with same last name no relation. Panicked and Zelled them $200 (Talked down from $800). Payment is sent but pending, probably due to it being a large or first time payment. Don't think I can cancel it. They where pissed no immediate money. Talked in circles on phone for 30 minutes, agreed to resume messaging tomorrow (This) Morning at 8am. Don't know what to do. They showed some screenshots of a background check website with list of other family members not in group chat, threatening to add them. I don't want to get outed/ explain myself to family. Should i Block/ not respond? I do not want to leave the group chat to avoid suspicion and also to see if they actually send it. People here say they won't send but some also said they do. Also both aunts responded, one left immediately and other started shit talking scammer. No other responses although late at night.