Thank you for the report! I’ve passed the info along for review.
As SirKruber has already suggested above, I highly recommend blocking the players on Steam. Easy Anti-Cheat will very likely detect and pick this up very soon, if not already.
As to the bad ping, there is a known issue since the Engineer update causing connectivity problems for Vermintide 2, which we are investigating. Though… you say it is also affecting Vermintide 1, which suggests there may be an issue on your end.
Are you experiencing this solely with Vermintide games?