Currys PC World

I bought two appliances from currys and one of them has not been delivered with a reason that they did not have any in the wearhouse anbd that I have to wait for the next arrival of goods. Because of this problem this appliance could not get connected on time as the other one and therefore I am still waiting for my landlord to give me another day for the connection. When I asked for compensation currys offered me £ 30 compensation and said that it is the maximum they can offer. I found this unfair because if I had to do it privately it would cost me much more. I just wanted to know if it is true that this amount is the maximum currys can offer.