Hello - My experience on this website is not based on business English training, however, my other business is exactly that - business English training. You can check my company's website at www.beyondenglish.com.hk. We are a trusted, online provider of business English training in China, HK and other parts of Asia.
We can provide online training for 1 month - 1 hour per day for 5 days (total of 20 hours) for 25000 INR. Now, this is twice as expensive as you're currently saying your budget is, but with my company, we already have an online platform, course catalogue and experienced trainers. The other proposals do not. This is a fantastic price and for the amount of hours you're requesting, you will not get a better price for the same high-quality training.
I look forward to hearing from you,
Thanks,
Dane