If you purchased your proxies somewhere, it means that your proxies are garbage and there's nothing we can or will do.
Please don't ask us to fix this situation, there's nothing to improve or fix. Coding a good proxy service is almost like a rocket science, the proxy services you're using utilize poorly written proxy software. Open source projects like SQUID exist there for dozens of years and they're still improving the code. So if your purchased proxies are not working here, then YOU should solve this problem and not us.
As we suggest everywhere on this website, the thing that WILL work is SQUID proxy server. Installation instructions are located here
. If you are not a tech person, hire someone who can help.