Shipping By Cart. Not By Vendor

Shopify shipping sucks! I need to charge shipping rates by cart $ amount. Not by each individual vendors $ amount.
For example: For my $6.99 flat shipping rate I set for orders under $100 is getting applied 3 times if a customer adds something from 3 vendors. They should only pay $6.99. Not $20.97.
Shopify support says there’s nothing they can do. And I don’t want to pay a crazy monthly fee for an app just to make a shipping rate which shopify should already have anyway.

My customers are mad and won’t buy and I’m upset with this also.

I hope I’m posting this in the right place and that something can be done or I have to leave shopify.
Thanks!

Hi August,

Sorry to re-direct you, but this community is for developers using Shopify’s APIs to create apps and storefronts, I think you’ll need to ask on the merchant forums, in the Shipping board here: https://community.shopify.com/c/payments-shipping-and/bd-p/payments-shipping-fulfilment