Recalling a contractor to cure wobble - Recalling a contractor to cure wobble

[pendennis]

Dear community,
A contractor has just laid about 50 square metres of 600mm square sandstone slabs at my home. The slabs are supported by: (working downwards):
1-2 cm of cement
4-5 cm of sharp sand
approx 7 cmof a purple granular material, which was compacted by machine
under some areas there may be another 7-10 cm of older concrete
The undersides of the slabs were not wetted before laying

On the day after the contractor left I notice one slab near my kitchen door has a wobble. The contractor has been paid. Am I within my rights to call him back to take up and re-lay the slab? Would this cause more problems than it solves? The joint width is only 5-7mm. The main labourer was quite skilled I think but the boss of the company did some of the grouting at the end and has left cement on the slabs so I worry if he were to do anything it would end up looking worse. NB slab thickness about 12 -15mm, quite thin

[rab1]

if the slabs wobble call them back, any decent contractor will fix.

[Pablo]

if your paving is laid on such a thin bed of mortar then it's only a matter of time before it all fails completely. The construction method sounds highly unusual can you post some photos.

[seanandruby]

Are you saying he laid the cement on top of the sand ???
He did mix the two together surely ???

[mickavalon]

Sounds like you've been done mate, have you pics?