Buymmoaccount/Vbarrack i pretty sure they works together. i think i heard that Vbarrack bought buymmoaccount. buymmoaccount fraud me and try to sue me. Internet

ok. before i tell my story, im not from competitors.
on aug 27th, i sold my mage to someone and after 2+hrs, i decided to sold rest of account to buymmoaccount. they offered $324 and we were fine.
but here is beginning of fail transaction. on 28th, i got mail from paypal that they hold $324 because of claim from buymmo and reason was 'item is missing'.
i had noidea what the fuck was going on and i found out that buymmo commented on paypal, mage is missing. wow... they tried to fraud for taking mage :( 
fortunately, i had all the screenshots that i sold mage before i had transaction with buymmo and livechat conversation. so i send it to paypal to solve this case.
but there was another problem. person who bought my mage contact me and told me that his mage is just gone and call blizzard, they said mage is xfer'd back to original account which is i sold to buymmo. so i had to take my acct back to gave mage back to original buyer since i didnt got my money which means our(buymmo and me) contract is broken. 
after few weeks, paypal decided gave money back to me.
however, buymmo sent mail with some threat with news that scammer got into jail and they want fully money back or account back. So i said, i can give account back but i have no idea why u guys keep talking about mage that i never mentioned and since paypal take extra charge for transaction, i had to pay that if i refund ur money which means i just paid $40ish without getting anything.
and i gave them conversation on livechat which shows that i never mention about mage.
However they kept telling me give their money back or they r gonna sue me.
so what should i do? i have all the screen shots and tons of evidences which made paypal close the case on my favor.
furthermore, i dont delete any mail since i sold mage and account. of course there is mail that they tried to threatening me.
should i let them sue me and get lawyer? or just ignore them? 
i really dont care give my account back but they still wanna mage too or fully refund which make me waste extra money.

p.s. i post it on scambook. just telling before vbarrack/buymmoaccount try reply that this post is fake.