If you bought them "new". Then Sales Of Goods Act 1990 applies. Seek a replacement OR your money back. DIRECT from who you bought it from.
DO NOT be fobbed off with "sending it back for testing, or, you must claim from the manufacturer. Your CONTRACT is with the company you BOUGHT it from.
From what you say you have a defective unit. I.E. the seals have gone. Seek a replacement or your money back.
Jonathan.