Be aware;

they did the same to me. Like 10 days without payment.... Then a crazy XXX BTC (!!!! The amount won't help you to understand but it was like 2 months of earnings !!!) chargeback... I have asked an explanation multiple times... "We will check what is happened..." and nothing more after a week and they didnt answer anymore.

So... call this like you want but it's a SCAM to me. Maybe they are looking for money after the recent decreasing value of Bitcoin or whatever... BE CAREFUL.