Fixing footage accidentally shot in slow motion to sync with normal speed audio

I'm the Head of Editing for a podcast/radio show that releases a video podcast also. I was given footage from the guest view and footage from the host view, as well as the audio from the studio mics for both guest/host. The footage of the host is fine and all the audio files are good. But the video from the guest was filmed in slow motion without audio. I've been trying to speed up the duration and sync the timing with the guest audio. I don't know what they filmed in or with. The footage is high quality though. I keep getting it close to looking normal and then the footage loses sync down the timeline. Does anyone have a suggestion? I've changed the speed duration to 280% and have tried all three framing options. I'm not getting too far with this. When we do our shows at this studio they are in charge of filming/audio and send me access to the files afterwards. I'm getting very frustrated with this and could use any tips. Thanks everyone.