Really poor service

Was contacted by someone at OnAir on the 27th May with an offer to upgrade my current PVR to the new Explora. Checked with them to see if the package comes with an aluminium dish, which was confirmed, so I agreed.<br> Explora is delivered and the 25th June get a call from Colorado TV about the installation, they however say the dish is steel, not aluminium. Sent an e-mail to OnAir to query this.<br> Spoke to Annie David at OnAir who confirmed that the salesperson said the dish was aluminium based on the recording of the call. She was going to check what was going to be done, never heard back from her.<br> 27th June I get a call from OnAir confirming the debit order details, asked about the query I have and was told I should call them to follow up with them.<br> 30th June, still no response so resent e-mail previously sent.<br> Called again on the 29th July, 2 months after initial contact, spoke to a Michelle who just said the case will be escalated. No option to speak to someone in a senior role.<br> They can call to confirm payment details, but they can't get back to client queries!<br> In the meantime the Explora is in a sealed box gathering dust, while they receive payment.<br> How can I take action?