I think it is scam. read the topic after sending coins this is my mistake.
no one answers, no coins came, although more than two days have passed
Both of you should create new topics in
Scam Accusation section and write in more details what happened and how you got scammed by whalemixer service and for how much.
He was last Active on 18 July 2021 and it's unlikely he will come back any time soon, but if they come back again, they should refund you for your loses.