Beware of delivery charges from charity shops

We bought a 3 seater and a two seater settee we live 5km from the shop and was quoted 10€ on arrival we were charged 18€ we had already left 15€ for the delivery but was told by the driver they charge 80 cents per mile for delivery on top of the delivery charge of 10€ that we had written on our receipt on receipt we do not complain about this but to be told at the time that the delivery had increased 80% obv 5km her and 5km back but should we live in sucina 30km that would increase the delivery charge by 48€ the dog charity in san javier have never charged us for delivery and 10 euros for 5km is fare but should you live further away a 20€ table will increase by up to 60€ so take into account when purchasing from charity shops check the full price of delivery