Bearing in mind 3 months have gone by,venator and it would be a bit awkward to contact them to arrange to send it back now.
I would have e-mailed them, rather than waste time and calls again, to say what happened and to arrange them to send out a suitable sized Jiffy Bag with postage to cover the cost and send it back to them
I'd forget about it.......keep it as a spare or give it to a friend/family member to use, if they have the same equipment.
Big company too........not a small independent.....
They did give you hassle in the first instance, after all......:0)
Oh .....and say 10 Our Fathers and 5 Hail Mary's to make you feel better.......:0)