VW Polo - exhaust system

Following on from an insurance thread it seems that repairing my exhaust on my 07 VW Polo wont be covered by it as its been deemed wear and tear. Recently, the technique is failing, and you also need to deal with the exhaust for harley fatboy

The garage has said something slumped at the front of the exhaust and that the entire length is corroded.... and that it was from wear and tear rather than the rear impact (that didnt cause much damage) so my take on it, is that must have been dislodged by the impact as it now sounds like Im trying to be a boy racer

So assuming worst case scenario of entire exhaust replacement, any idea how much id be looking at cost wise from a garage? Ball park sort of figure....