Whatsapp and Wechat Program

Hi, I need a very experience team to help me to develop a software which allows me to send bulk Whatsapp/Wechat messages to unknown users based on "region" "country". The system must be able to have a huge database by itself. 1) I do not want to build it from scratch so i am intending to buy off a whatsapp program and get further customize work done for wechat. 2) Both programs MUST be within the same system. Front end design and back end design must be changed to my liking if not you have to work with the design firm which I have chose. 3) We are intending to resell the program, so the program must allow us to have agents account under us in which we are able to track their sales 4) Each agent account will only work with a license key for authentication purposes so that users wont buy 1 program and resell again. If possible, we allow 1 agent to have 4 sub agent accounts under them. Sub agent accounts must have license key for authentication purposes too.. 5) Should allow Voice call/Messaging/Images to be sent to user 6) Should have a reporting system to see the status ( how many people receive, how many people see, how many people deleted et ) 7) Agent accounts which are under the Master account --> The program should be the same as the master account. However, master account can disable certain functions within the agent account. 8) Master account will open for agent account, inside agent account i want about 5-7 standard template color and agent able to insert their logo. ** YOU MUST HAVE AN EXISTING SOFTWARE OF AT LEAST WECHAT OR WHATSAPP to bid for this. Before i award the program, i will want to go inside the program to see. Thank you