The good news is the A330 cannot stall in Normal Law.
Laws are just protections so the pilots can't screw up. Normal Law is the mother of all laws, as she will babysit any pilot. But when the protections aren't there, we need to know how to fly our planes. As been proven... the A330 will stall at altitude if you pull the stick back. If held in a deep stall, it may become unrecoverable.
My advice. Don't pull the stick full aft at altitude. Don't pull the stick full back in "anything" other than normal law, with all the protections working.
How do you recover when it stalls in Alternate law?
Identify the stall:
Buffeting, lack of roll control, lack of pitch authority, and maybe the inability to arrest the descent rate.
The last note "inability to arrest the descent rate" is a confusion to some. Why couldn't you arrest the descent rate? Because when you pull the stick back the A330 will help you with automatic nose-up trim, giving you what you want. This, combined with high power settings, may make it difficult to pitch the nose down.
You might have to pull the power to idle, and use excessive force to push the nose over. A bank may help too. Once your wings are flying again (no longer stalling) level them, and smoothly bring the nose to the horizon and add power.
The best thing you can do in the Airbus is fly it. Don't be afraid of the laws or buy into the concept that this is not a plane. It is a plane. You just need to understand it.
Like a woman, she is a complex creature with many buttons. (Don't push the wrong ones.) It may take you years to understand her, if ever. But it is worth the effort. Understanding is the first step to success. Study. Study. Study.
Enjoy the Journey!