Removing this stain from my shower

Sheela Belur
by Sheela Belur
We got our bathroom re-done with a brand new 4-piece shower stall less than 3 weeks ago and I happened to soak a red colored garment there last weekend and the color (pinkish) won't go from the base and a little bit on the side walls. I tried Lysol, baking soda, and comet. Nothing helped. The base surface is a little rough and the side walls are very smooth. Any helpful suggestion will be greatly appreciated.
The color stained base - and side - view 1
The color stained base and side - view 2
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