sunflower in North York

We hired Apex to fix and re-lay all the interlock stones on our driveway, they quoted us a reasonable price in line with other companies. Job was done and we were told to contact them if there were any problems, there was a 1 year guarantee. 8 months afterwards many parts of the driveway started to sink, to the point where there was a huge bump getting into the garage and played a role in damaging car tires. I called and called and called, left tons of messages, finally talked to a lady who said the contractor will come and look. Never did. I tried calling over the course of 3 months but no response, no call back at all. i eventually hired another company and my driveway has been solid for 2+ years. DO NOT HIRE!