How can I get a pay as you go nano sim for my Ipad mini celluler

I was bought an Ipad Mini Cellular for Xmas but it did not come with a nano sim, I have contacted all servcie providers and no-one can provide me with a pay as you go nano sim, I can only get a contract nano sim, but I want a daily one like you can get for the Ipad and micro sim.

All providers advertise the daily packages on the Apple website but when you speak to them they are not available.

I feel like have been mis sold the Ipad mini as I cannot use it with cellular daily plan, unless I requested a nano sim at time of purchase (which was not done), so now apple say they cant help, has anyone had a similar issue ?