Operators are also often the first point of call for passengers wishing to complain about the service they have received from a taxi/PHV driver.
At hynny, yn aml gweithredwyr yw'r pwynt cyswllt cyntaf i deithwyr sydd am gwyno am y gwasanaeth y maent wedi'i gael gan yrrwr tacsi/cerbyd hurio preifat.