Balancing done free of charge

I had my wheels balanced by Tiger Wheel & Tyres in Shelly Beach, KZN just before leaving to return home to Johannesburg. The car shuddered the whole way back, indicating that there was a problem with the balancing. I took my car in to Tiger Wheel & Tyres, Rivonia today. Without even querying my assertion that the Shelly Beach balancing seemed to be defective, or even the fact that I even went to Tiger Wheel & Tyres in Shelly Beach, the Rivonia branch re-balanced my wheels free of charge! What service!