Moans and groans

OK - not only do I still have this ongoing dispute about my Chinese lanterns ……
The same company have sent me three hundred snowdrops that were supposed to be galanthus elwesii (giant snowdrops) but are in fact galanthus woronowii(broad leaf snowdrop).
I have both of these in my garden from years back and know the difference.
The so and so’s are refusing to acknowledge that they have sent me the wrong snowdrops. 
I have planted them ten to a 6 inch pot so now have 30 pots of galanthus woronowii instead of the snowdrops I ordered.
The company expect me to wait and see what develops and refuse to even consider that they have sent the wrong bulbs. 
Galanthus elwesii have blue grey leaves and the ones they sent me are bright grassy green floppy strappy leaves as in the photo. Not only were they the wrong sort, they were so small that there is no chance of them flowering this year!
I have lost a whole season. 
Despairing over this! They are treating me like an idiot.
Any ideas???