Being over-charged with monthly subscription fee, eventhough I already purchased the lifetime premium upgrade

Hi, i was overcharged for 2 subsequent monthly subscription fees (both April and May), even though I have already purchased the life-time premium upgrade on 27th of April.

Another issue is that, even i have purchased the life time premium upgrade, but, the life time premium bagde is not shown in the "Premium section" on the setting in my android phone's UPNOTE application. Supposedly it should have shown a "Lifetime" badge in my phone's upnote as the one in my PC's upnote, but it didn't. 

I wonder would this be the root cause of why i am still being charged monthly even i bought the life time premium upgrade last month?