How to Choose a Web Design and Development Company in Dubai?

I run a small auto repair shop in Al Quoz. Last year I paid a company 7000 dirhams for a website. They delivered late, the contact form sends messages to spam, and the gallery images do not load on Samsung phones. Now I need a proper web design and development company in Dubai that actually tests sites before launch. How do I check if they fix bugs after delivery? Should I ask for a contract that includes free corrections for the first 60 days? What questions reveal if they care about quality or just collecting payment?