Just to let you all know and thanks for your comments, I got this sorted last night. I asked the landlady if I could get the receipt and she said her husband dealt with it. I asked which company they used, again she had no answer. She seemed taken aback that said I would get a second opinion and that I would confirm how it happened. As I spoke directly to plumbers and they told me this could happen on it's own and I would confirm this and it seemed they knew they were in the wrong. She stated that we seemed a little angry when she viisited us and we spouted legal stuff. I said, no, we said that because we received a text from your partner stating it was our responsibility before even looking at the issue. So I stated what else could we do. It was all left amicable and we have moved on and said how we should deal with this in the future. Great stuff!!!