[I presume the context is that of an e-mail to a subordinate about a product problem]

About Oxidation

Dear Canga
You know we have had problems withabout oxidation for 5-6 months. But you haven't been able to solve it yet couldn’t have solved it. Are you planning anything ? We have installed the/a treatment system as your recommended.
Our products are continuously being rejected conitionusly by customers. They not notice at entrance [Anlamadim; belki: "They do not notice any problems at first". But Aafter a fFew Mmonths, Tthey find/see ’re seeing oxidation on the product when they want to use it product.
I want [this is very direct and suggests perhaps anger on your part; the usual polite formula would be "I would like"] to see your plans about (fixing)/to fix this problem in 2 hours/two hours' time.

Best Regards,
Nevzat