My own fault for not looking at reviews. But hopefully someone else will avoid making the same mistake.
The tickets I was sold are invalid. The stadium confirmed these will not work, so had to then go directly to the official vendor (which is what I should've done in the first place).
To top that off, the initial charge to my credit card went up by 1.5 times the next morning, had to quickly cancel the credit card (which cost me yet again).
Overall, I'm surprised this site can still legally operate, I hope it gets shut down and the owners are dealt with as appropriate.