You mention you had acne breakouts and peeling from injecting the scars. I question if you didn't have an exacerbation of a cyst like structure underneath the scar. Sometimes, acne cysts scar the skin, but the cyst can have a lining or capsule that remains dormant and the filler might have disrupted it. This can happen with all resurfacing treatments too, but it might be worth a try. Multiple Fraxel restore treatments have helped many patients with acne scarring. Another modality involves the very careful application of a very strong chemical peel agent to the base of the scar's surface, done multiple times, weeks apart. Over time these "wounding" peels, help create collagen underneath the scar and the scar lifts up. Another treatment is called punch grafts. If the scars are narrow and depressed, they can be cut out and replaced with a narrow skin graft from behind the ear. These are usually done on "ice-pick" scars, not shallow "crater-like" sloping scars. There are some doctors that use Silicone injections for underneath acne scars as an off-label treatment, but you might have the same peeling result as you did with the Restylane. This treatment is controversial as there is a risk of migration of the Silicone and the delayed development of granulomas, or nodules, even twenty years, or more after treatment which would need surgical excision possibly, and this could leave you with more of a scar.
See an experienced acne scar expert in consultation, whether a board certified dermatologist or plastic surgeon.