Hi willy and welcome back. it has been a while.
With that said how can I deal with this or what can I say to defend myself.
My first suggestion is to NOT defend yourself. You are not doing anything wrong or anything worth defending in the first place. More importantly though by defending yourself it is like saying you are doing something wrong or at least that is how it will most likely be interpreted. So do not defend. Have you read
Don't Jade? It explains how when we justify, argue, defend or explain our actions, words, etc to a disordered person they often feel invalidated. When that happens, they will often ramp up their behavior.
I understand you have a strong stress reaction to them so I am not sure how best to advise you other than what I said above. You could combine it with
Validation and
S.E.T. but that is going to involve being relatively calm and centered when you are using these tools.
Have you seen a psychologist or psychiatrist to help you manage your anxiety around this issue? Are you currently taking medication for stress or anxiety? I ask only to get an idea of what sort of support system and tools you have to help you deal with this.
One other suggestion is to simply say (about the lawn) "I will be more than happy to make calls to find someone to mow your lawn and then you can work out payment deals". hang up. close door. Would something like that be possible?
Have you tried these techniques with them before?