Is there any possibility of returning Tankoins spent?

Hello.

Yesterday, 06/09/2020 I bought by error special bundle in the shop. I was watching what things contains the offer and I click on buy bundle by error. This bundle contains: Shaft XT skin, shaft mk2, Nightmare animated paints, Rapid-fire mode augment and aqua effect for shaft. I bought this offer with tankoins. I had shaft mk8 and the augment before I bought the offer.

I will use the tankoins for buying any other offer, but no this one

The offer cost around 8500 or 8000 tankoins

So, my question is. Is there any possibility of returning tankoins for buy another bundle or is imposibble? Please I want other offer. 

Thanks