Originally Posted by Unregistered

As what the other poster asked, are all 7 years relevant? If so, you should gun for a MX11 which will naturally mean a higher basic. A person who joins service at MX12 as a fresh grade typically makes it to MX11 between 3-6 years.

There may be a variety of reasons as to why they are offering 12. It could be they don't deem all your years relevant. It could be that's the only grade they are hiring for now. In short, before you reject, suggest you speak with the HR to understand. So at least even if you walk away, you understand why.