Disgusting service

So, <br> I had plans of selling my bike, got an interested buyer and when I did my testing the bike wasn't running smoothly - Contacted maniacs to come collect it and sort it out Sonic was ready to sell.. <br> Initially agreed on +- R600 to clean carb and charge battery (common problems apparently) <br> Rarely returned my calls when promised, then 3 days later tell me after all their efforts they can't find the fault, and my bill is sitting at 960 .. But advising that it could be an electrical fault and a few more hours labour is necessary, eventually coning across the problem a full week later of water being in the carb, bill now sitting at 1600 , after the initial 600 for collection and cleaning... <br> the new buyer contacted them for advice on the shape of the bike, Knowing full well I was trying to sell the bike, they insisted he come to see the bike personally without me being there.. But to no avail . I eventually get a call saying the bikes good to go, meet the buyer at their shop and make small talk with the father of the son wanting to buy the bike, and yet under my nose they convince the son him a bike on their floor is better bcoz they worked on mine.is this how we do busin