RC Visions review for ShipStation

Rates are not syncing with checkout cart, According to shopify provided by shopify, the customer paid $13.95 while shipstation is trying to charge us $94 What a nice profit margin Impossible to get a hold of them, "Contact us" keeps taking me into loops of support documents They don't care if the site is not converting because we only have FedEx account showing in check-out It keeps asking me to upgrade shopify to advance or plus plan while I upgraded to advance plan months ago. Shopify people felt bad and emailed them on my behalf