Useless company to try deal with

Starting a new online business, want to use Courier guy, as they have a office in my town. All I need is a flat rate to add to my products online. I tried the ofiice, useless, the the webpage, broken, then the whatsapp channel, useless, then email, useless asks me questions I already gave them all info on, finally tried calling them, useless! What a joke!