Hum that a good question. I've seen that laser a few times before as different members have owned them. I've never personal owned one so someone else may be better able to help you, but more then likely if you can't use one of the lens you already have it would probably be cheaper to just buy another laser as if I'm not mistake these are very inexpensive lasers that can be bought from eBay and amazon.
If you JUST bought it... have the seller Fix it or Replace it.
If you paid by PayPal you can open a Dispute within 45 days
of payment id the Seller does not want to help you...