Whatsapp Bulk Sender -- 2

Dear Bidders, You need to deliver the software and let me test it BEFORE payment because I need to verify that messages get to phones in my area. If you do not have experience in this kind of project please don't bid. 1. I need to send thousands of whatsapp messages to my customers in ARGENTINA and NOT to be classified as SPAM 2. You need to tell me how many messages can be sent every day or every hour. 3. I need to be able to choose between: text, image, audio or video messages. 4. The list of contacts should be read from a plain text file. 5. Must be able to use several senders (channels) also loaded from a text file. 6. Must be able to program sendings at a determined hour 7. Reports need to show how many messages are successfully sent. 8. Your software should not require serial numbers or any form of license. 9. Payment will be made only after the software is delivered and fully tested. This is not a spam tool, since my clients give me their numbers to send them info I dont need any particular coding language, as long as it works it can work under Windows or I also have dedicated linux server. Thanks a lot.