I ordered an aluminium HALF gate for my passage

I ordered an aluminium HALF gate for my passage. They came to measure and 2 days later came to fit, it was too wide! Took it away and 1.5 weeks later delivered another gate totally bent, scratched and missing pop rivets! They came to collect again! It's now 3 weeks later and I've heard nothing DESPITE paying 100% for the gate which was a huge mistake! I wrote to the owner who has not even bothered to make contact yet on their website they say "we want to hear from you"! I'm warning all builders in the St Helena Bay area NOT to use these contractors!!!!!