You should certainly decline those contracts.
Especially if the company not a system-intregrated one... How to find out if it is one? Well... then you always get a message about a possible contract before or you participated in the contest.

Yet four contracts are very curious.
So please decline those contracts.
And you may want to report that company, too. Then send me a PM including the Realm, company name and User-ID and I will take care of this case. Please make sure that you send me that information via PM, not in the public boards. Denunciations are not allowed in here.