Excellent journal...Worst app ever!

I love this journal (subscriber to print and digital for three years and occasional reader for 40 years).
Readability on Ipad is good.
There is a recurrent problem with the logon function!!! Every once in a while, the app asks you to pay for the most recent edition despite a valid subscription and logon to the personal account on their website (happens even to previously downloaded versions!?!).
If you are late with paying your subscription fees, you loose all previously downloaded editions on your iPad (so much for an electronic library). Contacting them doesnt get you any reaction for a long time as others mentioned.
A journal of this quality and reputation deserves a better app and a better service team!

Eckhart57 about Scientific American, v2.0.1