All is lost........?
No, not at all.
Years and years ago l had a BMW bike and a bodged gear box repair worth over three grand by Motohansa.
I took them to the Motor Vehicle Industry Repair Council (l hope l got it right!?) in Five Dock on the recommendation of an insider, a friend of mine who was an NRMA examiner.
The whole exercise was f r e e of c h a r g e !
They made the repairer fix the problem to "t h e i r s a t i s f a c t i o n at h i s e x p e n s e". Which they did. To my satisfaction. This, whoever, and the attitude of Tom Byrnes later Procycle in St. Peters put me off BMW's for life thou.
So not all is lost.
Each industry in NSW should have something like a governing or licensing body which you or me could turn to in cases like yours. It is not widely known but it is there, l was told. Ask or ring around or Google the living daylight out of the subject, you will succeed.
In the mean time hit them where it hurts the most anywhich way you can.
They deserve your worst, no doubt.
In the future I would not buy a PVC inflate - like l did - but only a HYPALON one. They are expensive but last a lifetime even if you leave them in the Sun.
Be persistent, never ever give up! Cheers!