Was returning a faulty product, and was treat awf...

Was returning a faulty product, and was treat awfull by the girl who seem to be the supervisor on the service desk. I was been offered a credit note, as she said unless they could try the faulty product, she would not be convinced that it was faulty. However, it was a soap dispenser which was quite obvious that it wasnt pumping.
Theyneed to made aware that a faulty product is not fit for purpose, and therefore as a paying customer I am entitled to a full refund, which I eventually received.