Spots and discoloration on a Neofinetia

[Nexogen]

It is difficult to get a correct diagnosis. Sometimes, because of the too high price, give up those plants. As this plant looks, I think you should think of a nematode infection or spider mite. At the same time you can think of a mineral deficiency. Probably Abamectin (Avid) and trace minerals is indicated.
PS: It's just an opinion.