Yes you can but they are prescription only item and needs to be agreed by a medical professional, i.e your consultant... Hence medtronics reply..
Give the other pump companies a phone but bare in mind that they may well say the same medtronic, but it is very much worth a try...
Is it possible to travel to another hospital/clinic where you might get a more pump friendly consultant?
I would contact INPUT input.me.uk they will be your best source of help, they can advise on pump friendly consultants, different pumps/companies, help if you need to fight for your pump privately or funded... They are very good indeed check them out
Good luck, don't give up, you may have to battle but it is well worth the fight..