Airwick Money makers

Good day. I have at least 5 airwick machines which don't funtion anymore. It works until the first canister is empty. The canisters are the correct canisters, batteries have been replaced and yet it doesn't work. Those items are quiet expensive and it's a waste having to replace the canisters and machines. I called customer care who says that I should return it to the store with the receipt. Be reasonable - who keeps such receipts. I will never purchase your products again and will discourage people as far as I go from purchasing it. I truly expect a greater sense of loyalty to your customers.