Similar (but no visit from the The Fuzz)
I had something similar- was contacted by a company I used to work for (many years ago), saying that a client of theirs was screaming blue murder- their “IT Manager” had been on because one of their critical servers had stopped working and the explanation he came up with is that I had hacked them. So, mainly to clear my good name, I went onsite with a team, and found a load of suddenly misconfigured settings and config files. A quick check of the logs and I had a local IP address. Which lead right back to the “IT Managers” own computer...