Dear Members,
A very interesting thread indeed. While the point about "sham contract" has been made by many learned members, the reality is that many government organizations also have such arrangements due to various reasons. Just because the contractor has changed doesn't make it a sham contract; it generally is for a genuine requirement, a genuine tender, and its outcome.
Manpower contracts in government organizations
When it comes to manpower contracts in government organizations, the competition is stiff, and the contractor doesn't have any latitude in quoting (it's minimum wages + other statutory benefits + a wafer-thin margin). The competition is such that multiple vendors are declared L1, and then the contract is split equally amongst all L1s. In such a scenario, the organization may very well end up with a new contractor every year.
Continuity of employment and benefits
Now, from the organization's point of view, it makes sense to continue with the same person, provided the new contractor agrees, for practical and convenience reasons. From the person's point of view, this ensures continuity of earning, PF, and other statutory benefits except, of course, Gratuity.
Gratuity and new Wage & SS Codes
As far as Gratuity is concerned, the issue will be resolved if the new Wage & SS Codes are implemented. I am sure a private organization has more latitude in these matters.