Personally, I would say that sounds like trespassing if they haven't provided you written notice nor received your consent now that you have taken possession.
Unlike a rental situation where 24 hour written notice for entry is all that is really required - you own the suite and unless it's an emergency I don't believe they can do what you're asking.
If you have a lawyer I would give them a call and just ask what parameters are being violated --- maybe also review your contract --- I think they can come and go until work is completed and signed off on as completed but that is usually prior to possession from what I have seen.
I worked for a window company in a past life. If we needed access to site for something, we arranged it through the builder (single family or multifamily) - they granted us the contractor access. Once the owner took possession if we had any work to finish up or warranty work to do or whatever - we had to arrange that with the homeowner as we were told the builder could no longer give us access. Take that for what it's worth but to me it sounds like all the other parties involved are violating your home and privacy ... **Personal opinion not a legal opinion***
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