Received 2 faulty awnings

Ordered 1st Sunncamp Mira 390 awning (with annexe)in May 2012 and found that it had holes in the top and dye had run through. Outdoor Megastore agreed to collect & replace it. Replacement awning is also faulty in that the annexe that cannot be attached because the zips are on wrong. Outdoor Megastore refusing refund because I'm out of the 28 day time limit for refunds. I could not test the replacement awning within the 28 days because we were not going on holiday for a few weeks and were unable to fully test the awning. We had already booked a weekend away to test the original awning and were not able to book another weekend so soon. They collected 2nd faulty awning and say they will return to sunncamp for a repair. They have had the awning for 2 weeks now and I havent even received a phonecall or email to say whats happening. Ive rang them today and they say the awning is still in the box and hasnt even been opened. They will try to send it away to sunncamp today. Appalling service. Original awning bought and paid for in May 2012 and we are now in September and I still havent got a useable awning. Will definitely not be buying from them again. Sending out 1 faulty item is bad enough but to replace it with another faulty item is very poor. And to collect the 2nd faulty awning and leave it in a box for almost 2 weeks without anyone even opening it is terrible service.