Telephone handset in-line amplifier FAQs

I recently ordered a Geemarc CLA-40 in line phone amplifier from your catalogue and it seems to be faulty. When I tried to connect it the battery LED does not light. I have tried a couple of batteries, with no luck. The dial tone comes on but is not amplified. I have checked all connections are correctly plugged into the sockets. I want to use it in work and was unable to test it at home as I have an amplified phone.

Could you please send me another one and I will return this one asap as I need this phone for work.