Hey there,
oh my...I guess someone just got too involved in something ^^ Let me get that straight: Save was not able to send the demanded Dildo so you got a BETTER version which you are reluctant to use. Now after a lot of trouble Save offered you a sticker to send the item back but you refuse to...because it is not "neutral"...Well, I guess Save did what they could. So why don't you just send the package to them? Is your mum working in the post-office or what is the problem in sending something that has the word Dildo on it.
I am pretty sure that Save won't accept the shipment bill as they send you a return label. Probably the package will be send back to you (as it is more than twice the shipping costs to do so). Then you have to take care of it.

Anyway, I never experienced any problems like this. I guess it's just bad luck and lack of communication that led you there.

Anyway, have a great day.

Luci