If you are facing this problem again and again (in this bot @TruecallerR0Bot)
There are two reasons:
1- You have logged into the application after logging in the bot.
The solution : log out of the bot and log back in.
2- Truecaller has detected that you are using a bot.
The solution : log into the application, then solve the capatcha test and log out of the bot and log back in (you may have to wait 24 hours)