I had the same problem.
Try my solution. Maybe it will help you:
http://help.doit.im/topics/9692#comment-2
My Pro doesn't work.
tutburatino 02/24/2019 14:36
Platform:All
I paid for Year Pro via Google Play Market for 3 years every February. I attached the receipt in this feedback. But I have not received Pro in this year.
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03/02/2019 14:41#1
PRO
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03/09/2019 17:19#2
Doit.im
Thank you very much for your feedback!
We've checked to find your Pro account works well now.
If any further problems, please feel free to contact us.
Nice day!