Help? Poor service from task rabbit for Ikea

I have read with interest the various threads on this forum for how good and cheap task rabbit is and how the user (ie me) would say what they were prepared to pay and people offer to do the work. We bought 4 Ikea wardrobes with sliding doors and task rabbit are the recommended installers. We were told how much we would pay by task rabbit and paid nearly £300 for the work which on line said would take 2 men 13 hours but actually took 2 men about 4/5 hours. Anyway we left then to it, they installed, we had a quick look at the wardobes as the guys were at the front door by this stage and left. On closer inspection the back of the wardrobes are not connected to the internal shelves in all places, the doors are not all level etc. We have been trying to contact task rabbit every since to get ths rectified (3 days). There is only an emergency line and no one has called back yet despite leaving about 6 messages and no other way to talk to anyone. Does anyone know how to contact them or suggest what else to do? Ikea are not interested. The whole service offered by task rabbit has been pretty disastrous.