We agreed to 'go solar' after an unsolicited call from a company and general encouragement by the govt. We installed 20 solar panels and 5kw system 2yrs ago after receiving advice from sales rep to expect our quarterly bill to drop to between $60-$100. Our bill remains at $450 to $650. The supplier is difficult and denies this advice was given. The Office of Fair Trading QLD can't do anything. Please help us.