Blocked toilets can be caused by many different scenarios. When attending to a blocked toilet, it is best to plunge first as occasionally it may simply be excess toilet paper and plunging is the most cost efficient method.
However, a toilet may be blocked as a result of an obstruction further down the line, most likely tree roots. We would then have to locate the inspection point, which is generally buried underground, and use either a roto rooter/electric eel.
We also have the option to inspect the drain with a CCTV drain camera to ensure all roots have been cleared and no further blockages exist.