Feiler to Communicate

According to Frida and Jan Storbeck We must pay R500...We have more than 5 cars that we've bought and have been servicing with Basil green for years, one of our vehicles was stake on the border to be brought to South Africa and the service was skipped and all of a Monday we must R500 extra for the Bakkie that is on service plan, since 7 year working hand in hand with them we had never paid R500for skipping service, to day we must pay, no one communicated with us about this, no where it was written that we will be paying fees. we have skipped before and never paid R500