They were dropped off and pushed their way in the door by asking my grandmother to hold a box and then walked in.
The two proceeded to do their "demo" while we are sure one was casing the place. Later the van came back to pick them up and the two had to be pushed out the door and even tried exiting a different door than they had entered.
Needless to say, we are contacting the police. The "invoice" they left behind was a piece of notebook paper with no contact numbers or company information.