Has anyone shrunk the waistband on lulu lemon leggings?

I bought a size too big like last month and I'm trying to return them through the mail but I never have time so hopefully I can tomorrow. But the leg part fits good, the waist band is too big though so when i try and pull them up they just go down back and stretch back into place so my butt looks weird. Is there any way I can shrink the waistband but not the legs? or else i'll have to return the 2 pairs I bought and get a giftcard 😂