If the vendor had advertised "Boot on password" as a feature, and, after buying the product you found that this so called 'feature' is missing or not working, then you could have got in touch with consumer affairs.
Silly as it may sound, the above is true. You just assumed that your machine will have this feature (as most/all other machines have it). It is left to the company to either refund or offer another model.
Most branded PC's have customised BIOS's. You're generally stuck with what you get.
Also, your Home PC / Business PC argument does not make any sense as there are no industry/business standards which define a Home PC should have X features and a Business PC should have Y features.
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I think I had been cheated because I read all the manuals before I purchased the machine but those manuals doesn’t contain anything related to this fact
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Did the manual say that your particular model has "Boot on password" option?
If NO, then you have a baseless argument.