It happened to me the same thing: 4 italian pilots, we did TR at baltic aviation academy on 757 and after finished the ground, we have been waiting for 4 months for the base check.
They said they suddenly interrupted the contract with the provider. But they weren't able to find another. Now the situation is that we are desperately looking for a provider by ourselves, because within july our TR will expire. And for sure we will take a big legal action against the school.