what do u mean by bad installation?the installation procedure is standard and couldn't gone bad.balancing i believe so because sometimes the machine is scheduled late for calibration.i apologise for that.balancing is always done to 0 value/balance before proceed to installation.
since u know u come from far,advice u confirm price and stock before u go.many of my customers did that.at least my team manage to get the tyre u want for u even they have no stock at the moment..stocks are selling fast.so u can't expect 24hour have stock if u didn't come directy after u ask.