506 Sale & Bulk Discount App

I used this app for BFCM 2020. The discount worked really well at the time, however since the discounts expired and pricing went back to normal on the site, there is some residual code that is now messing with our google & social media shopping channels, it says the pricing is all still discounted when I tag products on line and when you search for anything on shopping which is now messing with the optimisation across all our ads. Shopify have confirmed there is code that needs to be removed and have recommend contacting a 'shopify expert' to remove it. So now looks like I'm going to have to pay $100s to fix it. Avoid!