Bought tickets in Viagogo- Plan B if they are fake?

Hello everyone! I bought some tickets in Viagogo to see Bad bunny in Madrid for this Saturday 6th. The seller didn't send the tickets yet, and even if there is still time, I have a lot of anxiety.

I am really thinking that in case they never arrive or if they don't work, I would try to get other tickets either in the same platform or another one.

Did someone do that?? Is it possible to b.u.y tickets in such a short notice??

Thank you!!