I have a wifi contract with them, we have been having connections problem so they decided to send out a technician to come check out what’s wrong

I have a wifi contract with them, we have been having connections problem so they decided to send out a technician to come check out what’s wrong. They have been rebooting and nothing seems to work. When the technician arrived they found that the tech who did the installation did a ****ty job one of the cables was short making loose connection hence the weak signal and no connection. The put in a new cable then all was working , now they charging us for a call out fee while the problem was with their installation why. They are ****** and also they don’t take black customers serious they only respond to the white customers quick. Mxm