I have an ISP that provide me with internet access but they limited my bandwidth 512 KB/S and I saw some ADS about VPN like Hide My Ass and they provide you with Unlimited data transfer will I get bandwidth more that my ISP provide
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I think you are misunderstanding what a VPN does. A VPN is simply an encrypted tunnel between your computer and the host (the VPN company's server, in this case).
Your ISP still only allows a capped usage per month (for you, that is a speed of 512KB/s - for me it's a 250gb/mo cap of data @ 12Mbit).
So in short, no - a VPN will not boost your bandwidth, it simply hides what you are doing from them to a greater extent. Your connection through the ISP is capped.
Their claim of "Unlimited data transfer" is just saying you can route as much traffic through their servers as you want and you will get whatever speeds are available between their server and the connecting site - that does not mean your home connection will directly be any faster.