First of all, Thank you so much for this hard work! :-)

I got Wazapp registered successfully.
Wazapp could retrieve/sync my contacts (even a previously existing group).
I have successfully sent messages to people.

However, it shows a red dot on each message. I came to know only when people informed me that they have received my message.
I have tries quitting wazapp from menu as well as rebooting my phone. The red dot still stays.

Also, I was able to receive people's chat ONLY ONCE, after i "quit" and restarted the app first time. After that, I haven't been able to receive any chat.

As per a suggestion, I initialized wazapp from the terminal. Here is the log in pastebin :
Wazapp Terminal Log

I hope it becomes useful in debugging, and solving this problem. :-)