I have called three interlocking companies in Toronto but none of them could show me any awards or certifications. One guy came in an unmarked van and asked for cash only. I want a professional company that has been recognised for quality work. How do I find an award winning interlocking contractor in Toronto? What specific awards should I look for? Do reliable companies offer warranties and use proper geotextile fabric? Please recommend a trusted company that serves the GTA and has proof of their good reputation.