The iPad Mini model A1454 is designed and will only work on LTE bands 4 (AWS) and 17 (700b MHz).
Since 4G means so much, you may have to ask your specific carrier if they use either of these LTE bands. Even if your carrier operates in those bands, there still isn't a guarantee they support iPad so you'd really need to research that with them directly (or at least consult their website).
In addition to LTE, the mini is listed as supporting these other data protocols and frequencies at http://www.apple.com/ipad-mini/specs/
- GSM/EDGE (850, 900, 1800, 1900 MHz)
- UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz)
In the US - these bands are marketed as 4G from AT&T and speeds are possible to overlap with LTE speeds even without connecting over LTE. If you are disappointed with your purchase, hopefully the vendor can assist you with a return or at worst, you can work on selling your iPad since new devices with no scratches can often sell for list price or even higher in some circumstances.