Day light *******. Don't deliver

We received a huge bill in January. When we queried this, we were told that they were charging for months from last year as they were estimated bills. When I argued this as I send my reading through every single month they checked and told me that the reading didn't pull through on the new system and now we are liable for the bill. The attitude of the staff stink... like it is a problem for them to assist a person. We requested and paid for them to do a metre test as well, as they said the wattage is high. We are still waiting. When we try find out about this at the office, we get told they don't work on a Saturday and promised to be called on Monday, this just doesn't happen. When you try and phone, no one answers the phone.