I wrote to support, proposing the solution that the OfficeSuite popup included an option "do not show again". I also suggested that, in case they did not take that solution, they should refund to me.
I did not receive any answer from MobiSystems, but I did receive an email from Google Play saying that my purchase was cancelled and I would have a refund (I assume that Mobisystems arranged that).
I am not actually very happy with the solution. I paid 5€ during a promotion so, if things get solved, and I wanted to go back to Pro, I would possibly have to pay 10€. But well, it was me who asked for that (albeit not as the first option).
Anyway, if MobiSystems prefers to make a refund instead of adding the option "do not show again", should we anticipate that they will add more intrusive advertisement (and that will not disappear after a few times)?
Regards.