Vanda Miss Joaquim care

[Geraldq]

Hi all

I am new here and new to gardening, so pardon me if I should post this somewhere else.

I bought a young Vanda Miss Joaquim in March this year. It has nit been doing well. 2 months ago, I found that it was attacked by spider mites. Looking at the burnt marks, it appears the investation happened for quite a while before I discovered.

Now, even though I have gotten rid of the spider mites, the burnt marks still remain and the leaves look very wrinkled.

I used charcoal as potting medium and water twice a day. I put it at a windy spot with mostly indirect sunlight.

What have I done wrong? Please advise. Thank you.