BroadcastApp - program for massive messages sending.
The program is able to send targeted (addressed) messages via WhatsApp.
If you have clients which you want to inform about your product/service, then this program can be very useful for you.
It is said that address messages (ie messages with client's names)
are not treated as spam, and have a better chance.
Initially, the program was created for one businessman from Siberia. He had a list of more than 20 thousand clients which phones were parsed from somewhere in the internet.
By the way, I have a rich experience in writing various scanner/parser and web-bots, so I can also help you with getting lists of clients.
Phone numbers takes from an excel file, but if necessary I can "bind" any source.
Also, if necessary, you can add a sending through telegrams, skype, email, twitter...
After sending messages, you can run the program to check the status of delivery - whether a client received a message, read it, or maybe already gave an answer.
The price is negotiable, but very small - it depends on whether improvements/changes are needed for you and which they must be.