Hi George,
I am surprised  because we had two Polos and one exhaust failed at 8yr old  and the other lasted slightly longer ,I was very impressed and had VW fit brand new OEM systems again then ended up selling both the cars  to friends for there Daughters .
If I am honest though the aftermarket prices for non VAG  pipes fitted were so similar to genuine it hardly seemed with buying a cheap  aftermarket version, I think so many People/members have fitted Millteks etc you should be able to buy one here cheap enough 
Hope you get it fixed