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Hello, thanks for posting
Without having any specific diagnostic codes for the vsc system it's a little hard to pinpoint the exact problem but it's most likely one of the wheel speed sensors. There is one on each wheel and the computer needs speed information from each one and sends this information to the speedo, if there is a difference between any of the sensors from the rest the warning light turns on.
It's very likely that one of the thin sensor wires from the sensor to the wire harness was stretched and broken inside the insulation during the suspension work, I would recommend taking it back and letting them know that this happened right after they worked on it, they should at least diagnose it and let you know what needs to be done, I've seen this happen many times so that's my opinion on this. If you'd like you can let me know the diagnostic code and I casn be a lot more specific with my answer,.
You can try clearing the fault by disconnecting the battery for a couple of minutes. If it doesn't I'll need specific code information to diagnose further.