Nice idea that does not work

I bought the app and bought credits because I wanted an app that could send, but not receive faxes. I tried to use it twice and it did not work for different reasons. In 2016 I tried to send a fax and the app could not find the ample credits I bought, so I bought additional credits to get the fax sent. I complained and they found the credits and added them to the account, but did not refund the more expensive credits I was forced to buy. Recently I needed to send a more lengthy fax. This was during the period when there was a new update every day. When I tried to open the app, the app failed to open. I contacted customer service. There were a number of time wasting questions and finally they, on June 30, asked for my log in ID, which I gave them, and since them they have gone silent. There are other similar apps available in the app store that work perfectly first time. So, I have an app that does not work and credits that I cant not use or even access

FRxxyz12345 about Send & Receive Fax App- iFax, v3.8