Bathroom sink clogged, used sulphuric acid, now more clogged! Ideas?

I have a bathroom sink that clogs up regularly – it’s been getting pretty bad. Have tried caustic soda on it previously, with little success. Lately it’s gotten real bad, so I finally picked up some One Shot cleaner (it’s mainly sulphuric acid) thinking this should do the trick. I poured some in, it started acting like crazy, I left it alone, then when the time came to flush the sink it turned out that it was now almost completely blocked.
I then managed to take the trap off from beneath the sink, gave it a good stare but it’s not blocked at all. Still, water won’t run through the sink.

What could be the cause of this? And what to do about it?

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