Wrong size delivered twice...

I ordered boots size 6 and they deliver a size 4, I email them twice and they do not respond. So I request a return and send the boots back. I then order the same boots again size 6 (paying delivery fee again) and then they send me a size 5. Both times the shoe box says size 6 but inside is a different size. Please sent me the size i want not a 4 and not a 5. I wear size 6... And the delivery fee...cause now i have to email you again and you just dont respond. By the time you help me...size 6 will be out of stock. Order no ********** 24 and order no ********** 97