Intentional Surbotage by a Contractor

I'd like to lay a formal complaint about the people that came to fix my neighbour's wifi today on Saturday 11th of January 2025 around 2pm in Newlands East, Durban. I asked them a few questions regarding a previous contractor that had installed my house. I was not aggressive, I just asked so that I could get clarity and understanding. I was satisfied with their response although I could tell they were annoyed that I had asked in the first place.

My complaint is that they left my wifi red although they were not working on my wifi. I was lucky to catch them before they left because one of them was saying "quickly let's leave " as soon as they saw me coming out to ask about my wifi. Of course they ended up fixing my wifi after I now confronted them but I have no doubt their intention was to leave me without wifi only because I'd queried something earlier. They were 5 indian males driving a blue tazz registration number that start with ND 4** ***. I obviously took the whole number plate but for security reasons would rather not add the whole number here. I'm only putting it for identification purposes