Debug and find out bugs in iOS and Android App

Hi Guys, I have 1 paid apps running on apple store and android store, same app just a different platform. The app has some bugs some known [just found out recently] and some are still unknown. So here is the deal. Your task would be test both the apps and find out the bugs, report it to me and resolve them, and upload the build to respective store and get it approved. I will provide you the code. No Generic Response. I am looking for specific information here. I appreciate if you add that in your proposals. I need your mobile testing methodologies, tools etc. that you use to debug the apps not just manual functionality testing. I have done functionality testing 100 times and still there are bugs. Estimated no. of hours or better quote me a fixed price. Regards, Nav