Exchange policy

Purchased an inverter for R720 in December23 to charge my laptop whilst traveling to Jhb and it didn't work. When I came to PMB in Feb24 I tried to exchange it and they tested it and saw that something was wrong with it. They said they cannot do anything as they have a 7 day return / exchange policy. Very disappointing as we bought other cables for it to make the inverter a permanent feature in the vehicle. What a loss of money. Would not support a business like that.