For me, the sad part is, that chances are excellent that all this started due to a misunderstanding. If I look at the cost, R1110 less R240 for the battery / 2 = R435 per quad. We take the R60 for a spark plug from that, we are at R375 per quad. Roughly the cost of 1 hour's labour. I seriously doubt any biker will expect a complete and full service on a single cylinder machine (regardless of cc) for as little as R435.
Misunderstandings can usually be cleared up, with reasonable ease, by negotiation and communication.