Judging by your transaction though, it looks like it's a batch payment, so the tx is likely broadcast from the site's wallet, and I doubt you have other options but to wait or hope support replies you. As you seem to indicate, you already know the consequences of online wallets, so hopefully you switch over to a wallet you have complete control over soon, especially as the fee situation doesn't look like it'll resolve quickly.
They're wrong about the fee also. 43 sats/byte isn't even enough today, and it definitely wasn't enough 10 days ago. Currently, for a 90% chance of confirming in 24 hours, the min fee is 151 sats/byte.
Sadly, i'm now really not optimistic about this transaction being either forgotten or confirmed.