Had a new front door installed into poured concrete building. Huge gap was left down the side of the wall between the frame and the rest of the concrete wall itself. The builders filled it with some expandable goo that apparently sets 'rock hard', although the evidence we've found around the door feels more like polystyrene. Queried this with the door fitters and asked if this meant that the security wouldn't be that great given this. They just said it was as secure as you could get and sets 'rock hard'. Door and fitting wasn't cheap and I'm worried I'm left my premises more unsafe than it was prior to fitting the 'security' door? Is this standard practice? Any help appreciated as they also left my house in a right mess and caused loads of damage. They are asking for payment and I'm wondering if I should get another company out to look at it first?