Split, A/B Testing Price Test

Very bad, I insist for a long time, has experienced constant error, delay, unable to create the test, can't choose the product after test finally launched the first product price, but it's very wonderful is a few hours later I products in the price of shopify concrete was somehow changed, changed to test the price of group B, ridiculous! Customer support is slow to respond, I can never reach customer support in the instant chat dialog box, and the contents of the dialog box are cleared after refreshing. Not recommended for anyone!