I can't add widgets to sidebar

I have another company helping me and they can't seem to resolve this problem. I am very unhappy with them in general. I am paying mostly to fix problems that they create. I have given them chance after chance but I am very frustrated right now and looking for new team to help me. Am I at the right place. My biggest problem now is that I can't add widgets to my sidebar. They promised they'd fix it but left for the weekend without updating me - not fixed. HELP!