BLIND NIGHTMARE AT NORTHGATE........AVOID THIS STORE

Last year I bought a blind for 1 of my kitchen windows, the colour was Pewter (like a silver). In Jan this year I went back and asked for another blind in the same colour. The sales rep was so busy chatting on his phone, he couldn't calculate my measurements to mm, I had to do it myself. I explained that the top block and blinds need to be the same colour. He said OK. I went to fetch the blind, and the it was not the colour I chose. They sent it back to the supplier and even asked for a picture of the blind I already have so they can see what it must look like. 2 weeks later I go fetch the blind, I tell the guy (who is still chatting away on his phone), that I will be taking the blind home to double check the colour against the one that I have. The blind is correct but the block is now brown!!!!!!! Now all of a sudden they can no longer assist me because I signed for it and the sales person ordered from a different supplier than my first blind. That's why it's different colours. WHAT THE HELL ARE YOU PEOPLE TRYING? SO WHOEVER HAS A SALES REP AT THE BACK GETS ALL THE SALES, REGARDLESS OF WHAT I ORDERED?????? HOW IS IT MY PROBLEM THAT MR WHATSAPP INITIALLY WROTE DOWN THE INCORRECT SUPPLIER???? You guys assisted me up until the point when I took the blind home to double check. Now all of a sudden there's nothing you can do. THIS IS DISGUSTING and I will make sure that everyone I know is made aware of this **** service at your store.