SMITH&SMITH review for AfterShip Order Tracking

I signed up to this app and after the free period the account reverted to the free offer. I have tried to upgrade to the $9 per month plan and within shopify have attempted to approve is monthly fee but then I am taken to the aftership page which says I already have an account and it asks me for my credit card details. For some reason I am unable to add this $9 per month fee into my shopify monthly account. I prefer to pay all of my app fees through shopify in one single payment. I have now contacted after ship 2 times in the last 3 days via the contact form inside the app and as yet have not received a single response. The app looks like exactly what I need for our online business and I only hope by writing this review it triggers somebody to assist. [email protected]