There has been zero evidence presented that they were spies. The fact that they were detained within days of Meng's arrest and released within hours of her being set free should tell you all you need to know.

The CCP has engaged in hostage taking because one of their elite members was arrested.

At any rate, now that they are free - Canada can go ahead and ban Huawei 5G networks like the rest of the 5 eyes (save NZ I think?)