Bug fixing Existing fully custom php Ecommerce clothing site

We have clothing e-commerce website that needs bug fixing for now. We looking for a talented skilled team/ person who will deliver a bug free site with detailed approach, reasonable working hours. The website is a fully customized website, we need it carefully re- adjusted, to avoid messing up other functions in-order for it to perform flawlessly. We are looking forward for a long relationship so as fully handover the site to manage and to develop new ideas. Our customers have been having issues cropping up like - extra items not chosen by the customer appearing on their basket - customer having another customer detail appearing on their accounts - some order details from the website not appearing on world-pay - Query dates...query coming on 24th but re-dated to 30th when replied to We have another website to be built hoping we can find the right programmers to also build the new site for us. Portfolio links is a must and must speak english well.