Damaged goods and only part ordered

I ordered 3 items from Grabit. They delivered quite quickly however the box they delivered was firstly opened already as well as the contents inside were damaged. I only received 2 of the 3 items that i paid for. Someone else signed for my parcel otherwise i would have checked. There is no number to contact them on and i have send them messages through their online website as well as emailed them and have received nothing back from them. This was 2 weeks ago and still nothing. Such bad service