Beware of ECO

I've bought 2 tanks, some years apart. In both cases the inner black liner was missing or incomplete. The lining is to stop sunlight causing algae, and even to prevent leaking ("weeping"). They boast an ISO9001 certification. If the non-conformance rate is say 1%, then my experience represents a 1 in 10 000 chance - hard to believe. Three weeks later there is no replacement, and no communication from them.