+351 review for Discount Ninja Promo Engine

The app looks super interesting and has a lot of features. We installed it hoping it would help with our conversion rate but it has only caused us trouble. After asking for the support to install the Dynamic Pricing on our theme, we had a bug in our store where after adding a product to the cart, the load button keeps spinning, and also the cart is not being displayed correctly, no product is being shown. They installed the code for Dynamic Pricing and immediately reported this bug and said that it was coming from another app that was installed in our store but we had never used, and never caused trouble. The bug was not happening before the changes did by Discount Ninja, so I asked them to undo the code they had done, they said that I could just install a backup version of the theme and the changes would be undone. I did this and uninstalled both "Discount Ninja" and the other app, but the bug persists. We also talked to the support of the other app (the one they said was causing the bug) and they said: "We have checked this over carefully and can confirm this isn't related to our app. Our app won't edit theme code (specifically to avoid problems like this) - everything is contained in a javascript tag, and when you remove the app you remove the tag. I've checked your site and the tag is no longer there. ​ I hate to point to another developer - but if Discount Ninja have been editing your theme, then it's highly likely the issue is related to them - and I'm pretty certain they will edit your cart too." The theme support is obviously not able to help us because the theme has been changed already. Now I'll have to pay for a developer to solve this issue. Very disappointed. Don't recommend it.