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@ffm
Is it locked shut i.e., is the shackle in the lock body, or are they separate? If it's a newish lock then definitely contact Onguard or the shop you bought it from. However... I had a slightly similar problem with an old Abus D-lock so I may as well share here in case it's useful:
I opened the lock but then couldn't get the shackle back in. I could insert and remove the key, but couldn't turn it (like you, I tried WD40, hammering, pliers etc.). Eventually, by sheer luck, I worked out what had happened. The lock body is made of layers of metal sandwiched together. One layer had slipped relative to the rest and was obstructing, low down, the hole where the shackle went in and also preventing the lock cylinder from turning. I pushed it back into place and the lock instantly started working again.
So, if you can have a poke around in the lock body and check for something similar. Good luck!