Mixing Different Coolant

A few days ago I went to a Triumph dealership and wanted to buy some coolant for my 2018 Speedmaster and they sold me a bottle of Polaris Anti-freeze 50/50 extended life for 2 and 4 stroke engines. I tried to tell them that my owners manual says to use Triumph HD4X HOAT. They insisted that the Polaris was fine and to use it to top up the coolant reservoir level. I bought and got home, and was going to add it...but thought I would phone Vancouver Triumph to get a more authorized ( long time dealer of Triumph) dealerships take on the coolant type etc. The service tech on the phone told me not to use it, and to only use Triumph HD4X, and he would ship a bottle to me. I did not put the Polaris coolant in my bike and went back to the dealer I bought it from and demanded a refund, they still insisted that it was ok to use it. I was not impressed. I am currently waiting to see exactly what kind the Vancouver dealership sends me.

Has anyone else had coolant confusion? And does it hurt to run the bike with the coolant (stone cold) at level reading Minimum level?

I am a little worried that I should not run it until I top it up. Also the bike as not leaked any coolant and not sure why it would show Min level if it was properly serviced at the last scheduled 10K service.