Bug fix in Woocommerce (yiitheme-bazar) grocery website

I have an online grocery shop using woocommerce with yitheme's 'bazar' theme. I want to fix the following bugs: 1. On the ‘shop’ page, when we do 'add to cart' with some quantity more that one, it does not work. Only one product is added to the cart. Want a fix for that. 2. When an item is added to cart from the ‘shop’ page. and if we print an invoice, the size doesn’t comes (on the print). 3. In brand (variation/attribute) filter, I want a 'OR' search, but don't want to show brand with zero products. It should be possible to select multiple brand (with 'OR' operation) at a time. Preferably don’t show item count against brand filter. 4. Is it possible to have same facebook ‘like’ button for my website and my facebook page? E.g. if a user likes my FB pages, the 'like' also incremented automatically to my website FB 'like'. If so would like to do that. If possible plz quote separately for last two items. Later on, I would also like my website to be fully responsive.