Hi Lina
Where are you located?
This happened to another carpet cleaner in Hertfordhsire, he rang them on the mobile phone and they
told him they were off and he wouldn't see them again.
His response was to
REMOVE THE FRONT DOOR put it in his van and go

with the house open to the elements and any of squatter or vandal who cared to come in.
He rang and told them this to absolute silence on the other end he said your could hear the panic in their breathing as they realised that the open house was their responsibility not his at it hadn't been handed over.
The guy asked if he could send a cheque :

and was told to go some where not very nice

He was to frightened to meet face to face, so got his wife to meet the cleaner in a car park in the area who by the way had now also charged them for his wasted time.
They met up he got his money in cash and dropped the door on the floor by her car( which she couldn't get in as it was too big) and he drove away.

(This story was told to me by another CC in 2002 and swears it's a true story)