Poor customer service

My package arrived previously opened, I immediately contacted OnAir and informed them. They were very polite and said it would be sorted out as soon as possible. I followed up 2 weeks later they apologised and said that they would escalate it and replace the unit with in 7-10 days. Again no follow up on the promise, no communication. I followed up today almost 6 weeks from the original commitment to resolve the issue only to be told they have no stock.