I rent out a commercial property ( commercial lease) and run a clinic. I rent out rooms to other practitioners. There is a verbal agreement around rent days and times although I do have text messages from the practitioner confirming these and the agreement. She is very behind in rent and is saying she does not owe me the money, that I misunderstood the agreement. I want to lock her out of her room which contains her property until I receive payment. Where do I stand legally under property law or commercial law if I do this?