Unable to uninstall Commerce ifthenpay mbway

Hello,

I installed commerce_ifthenpay and soon after enabled commerce_ifthenpay_mbway. I then created a gateway with both plugins. After a while I uninstalled commerce_ifthenpay and later tried to uninstall commerce_ifthenpay_mbway when I was greeted with the message:

"There is data for the bundle MBWay on the entity type Payment method. Please remove all content before uninstalling the module."

I already deleted the gateways that I created, is there any reason for not being able to uninstall only the mbway module?

Thanks in advance