Having looked at your pic in more detail I think you're right. They can take pH from 6-7.8 and hardness up to 18 degrees, but they're a poor match for Malawis anyway. Your best bet is to return for a refund as the shop have clearly got it wrong.
Hey I know this is an old thread but I was going to point that out that these are Forest jewels from West Africa. Some people in Australia keep them with Malawian cichlids but my preference is to keep them with something like kribensis or the other West Africans. A much misunderstood species in my opinion.