That is terrible mate
Dont pay a cent, you asked for a particular service to a particular "standard" (The finish to the wheels.)
Trade Standards Act 1979 wrote:
"standard" means—
(a) a safety standard; or
(b) a quality standard; or
(c) an information standard; or
(d) a packaging standard;
You did not receive what you asked for and what you were willing to pay for therefore it is their responsibility to fix their mistake.
Trade Standards Act 1979 - Section 30 wrote:
Quality standards
(3) Quality standards may—
(a) regulate the design, construction, composition, materials, contents, finish, performance or other characteristics of goods;
(b) regulate the nature and quality of services and the manner in which they are to be supplied;
(c) make any other provision relating to the quality of goods or services.
If they refuse to co-operate, remember the Office for Business and Consumer Affairs are just a phone call away. If you let them know that, i am sure that they will co-operate with any of your reasonable requests, especially if you quote the above.
Office of Consumer and Business Affairs Website wrote:
Unhappy with your purchase or the service you received?
The Office of Consumer and Business Affairs (OCBA) can assist with complaints where the goods and services are advertised and purchased in South Australia. Remember: You may contact the Office of Consumer and Business Affairs at any stage should you need advice.
Best of luck with the wheels
Matt