@LDL I believe you're using a notification bot, pease your attention is highly needed here in this thread, we need clarification as to why your address was used in their chat.
This case has just become more interesting...
So far
@LDL has good reputation in Bitcointalk forum and we need his clarify about why his address linked with
topman21, we know who is
topman21 and he was got negative reputation in this forum. But has possibility with the scammer linked or use
@LDL BTC address and its good for refunding later. We can't make unilateral decisions after BTC address linked with
@LDL and actually we need his waiting respond, hope OP can get back his refund.