Modify / rezolve some isues in PRESTASHOP

I need a skiled person who knows prestashop to help me. I have some problems with some installed modules (on a payed theme) and I want to fix them. The modules that don`t work properly are: The most important for me : ON SALE MODULE -- it doesn`t appear on the webstore at any product that is at a reduced price. It appears on sale when you enter on am product, but is over the price! To make that the subcategories to be seen in the left side column. When a client clicks on a categorie, the subcategories to be seen in a column on the left side. To modify some automated emails. / earease some of them. To configure customer testimonials. To make employers to see the phone number of their clients in the orders area. (They can see the adress, but not the phone number) To add on the invoice the data of the company. The person who will accept this job, will work with me in future. I need a serious person who can help me at any time.