Pipes on the footpath leading to my property burst on a

Pipes on the footpath leading to my property burst on a Tuesday and I reported the matter to the water company on wednesday morning. A water company man came on thursday morning, looked at the problem. He advised me that the water was leaking at the rate of 5000 litres per hour. He also told me that he would report the problem and someone will come and sort it out. No one came until late in the evening when I contacted the company again and escalated the complaint. The escalation manager called me back and said someone will definitely come on Friday. Two technicians turned up at about 1.30pm on friday. They looked for the problem but left at about 5.00pm without sorting out anything. I reported the problem again to the company telling them, on every occasion, about the huge amount of water flowing and damaging the foundations of my property. No one turned up until the monday when they were able to find the fault and fixed the problem around 5.30pm on monday. I estimate that approximately 700,000 litres or 7000 cubic metres of water flooded the foundations of my house. I assume that water company is liable for the weakening of the foundations. What advice would you give me to make a formal claim for damage to the foundations of my house.