Thank you all for your comments.
@Silversitters I really appreciate your time in investigating other similar cases.
Unfortunately, there is no video footage or neighbours ring doorbells. Who knows? Maybe the neighbour next door saw it all from the window, but to be honest I cannot recall the exact moment I got injured, if it was when I was still outdoors or inside the house. It happened so quickly and I noticed the pain only after 5 or 10 minutes.
@SteveS I was injured on Wednesday and the HO cancelled the sitting on Saturday. During this time I continued carrying for a pet that caused harm, but apparently the insurance doesn’t cover.
I would also like to say again that I enquired with THS support team since two days after the injury when I realized that walking was very difficult for me, even before informing the HO (which I did a few hours later).
I was hoping to get some guidance on the procedure to follow, but no instructions were given to me.
I asked if continuously biting the leash could be considered as an aggressive behaviour, I was told that it depends. It could be a way for the dog to play, but aggressive dogs show these kinds of behaviors: growling, snapping, lunging, and biting.
After talking for 4 days regarding the injury. Despite a lot of information was provided, in the last email I was asked what was the reason why the sitting was cancelled and I was told that she understood I was cancelling the sit because the dog is reactive to motorcycles, which I never mentioned at all.
She also delayed in answering, had to ask many times to get back to me and missed answers to questions which I had to repeat several times.
I wasn’t sure if she was making fun of me or if there was just incompetency . I had to start a new query and speak to someone else in order to go ahead.
To be fair, the dog is not aggressive, and was biting the leash almost all the time in an annoying, but yet playful mode. The last time, was a playful/aggressive and I found very hard to manage and we had to go back home. When we arrived, she wouldn’t come in and had to pull her with all the strength (the alternative would be let her going on the road with all the possible risks).
Said all this, I wonder if after reading the last messages it is still worth it to escalate the request to the manager or supervisor and see if they can have a second look at the case?