Job put me under bullshit investigation

[Zorophobe]

So, I just went into my workplace around 30 mins ago after filling out a holiday form due to surgery, only for my manager to tell me I was put under investigation because I didn't clean up properly due to no hot water, which was the company's fault after turning it off due to a leak. But now they are gonna try to use CCTV against me due to me sitting down for most of my shift due to me getting all my jobs done early and not having to serve any customers. What are your guys opinions on this.