That reminds me, must complain the ASA.
I've a feeling that is a bullshit advert, that should read:
We fix in 30 minutes AFTER we arrive, which could be a few hours.
PS top tip. LIE to the bastards, otherwise be prepared to wait a long, long time.
Tell them you are blocking a lane / junction / island and you've already nearly had a few cars hit you. Sound hysterical for extra effect.
When they arrive, just tell them some kind people helped you move it..
Alternatively don't touch them with a barge pole.