a lot of car shop busineses are understaffed (i cant think of any who can cope with the demand atm) and a lot of car shops deal with 'gunna's so its not uncommon (in my experience) to rarely get a return phone call.
ive always found it better to visit a shop in person, not only do you get an answer there and then, but you get an honest response on whether you ort to shop their or not.

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Long live the WRC