PLUGIN DOES NOT WORK WITH MORE THAN ONE SHIPPING COMPANIES

I cooperate with 3 shipping companies. I have an amount after which the customers get free shipping. But in order for the customer to be able to select which company he wants when he has free shipping I cannot enable the free shipping which is needed by the plugin to work. If I enable it then the companies does not show in order for the customer to select the one that he wants. This is why I have requested refund, as the plugin cannot work for me. If you can make it work or if you find me another solution then of course I will keep it.