Poor Response From Id After Reno Works Started

hi all, not sure if this post is correctly post here.

i engaged an ID, based on recommendation from a fren (who has 2 other frens who engaged this ID previously and has 0% complaints abt him). we met up with several contractors and finally decided on this ID instead becos he "wows" us over his creativity and really maximizes the limited space we have at home.

everything was smooth going, though very slow, as it took us very long to confirm and decide with him on what we actually really wanted. abt 2 months later, we are ready to start our reno after all the 3D drawings, colours, materials, laminates and all are confirmed.

it started with hacking of the kitchen wall, then it took almost 2 weeks for the electrician to come and settle the electrical works. this electrician is not from his ID firm, an external recommendation from him (his quote did not include electrical works, which was brought to our attention before we sign with him). he told me this electrician is very busy cos' he is cheap. so 2 weeks later, the electrician came with 2 guys and all works completed in 1 day.

then came another week of doing NOTHING.. just waiting (for i dont know what). then painting of the house started, and was completed in 1 day. touchup required, which ID says will be done only after carpentry is up. then we waited.. and waited.. for another week. in this week, only 1 thing was semi-done, which is installation of the water heater from citygas. in fact, the work was done by citygas (coordinated by him) and not the ID! shower screen and carpentry was supposed to be up this week, but i see nothing being done. everyday i chase, and i call, and i send sms.. till now, he refused to pick my calls!! sigh. he said will call me bk, i waited till neck long also never call. i'm seriously upset by this whole saga, and just hope he'll finish my reno asap. handover date already delayed by 2 weeks further, and i really dont know what to do with him!!!

but good thing is, i only paid a tiny sum of the whole reno. he hasnt really gone after me for the payment too. (was supposed to pay up nx week another 40%, but i decided to hold bk till i see proper progress of the reno). i think probably biz too good that he bo chup?

is there anything i can do to make him seriously get down and be prompt in my reno?