Developer Not Helpful, Template Full Of Problems

I wrote in with a few problems with this template. 1- Not all posts are appearing under categories. There are posts listed at bottom of site under categories, but when you click the category they don’t all show up. 2- NO POSTS are showing up on desktop when clicking ANY menu buttons. The only pages that show up on a desktop computer (after trying Safari and Firefox) are 2 pages I created. 3-I asked 3 questions to this developer and he doesn’t care to respond. The only question he answered after sending my list of questions is how to buy another template from him. I paid for this template and I have never had such a headache. I was very nice in my email and when the response only included how to buy something else from him, I was disgusted.