Johnson Creek has a very open, welcoming, return policy for the first 1 or 2 bottles. I thought Halo might be the same. I was wrong. Below is the Halo e-liquid return policy.
"Return Policy
E-Liquid: Unfortunately, we are not able to accept returns on e-liquid that does not meet personal flavor expectations. Taste is a very subjective sense that will vary greatly from person to person. We highly recommend purchasing a sample pack or 7ml sample bottle from our site to determine if our e-liquid is a good match for your personal taste. In accordance with our strict Quality Control guidelines, returned e-liquid could never be re-used for any purpose, so will not be accepted."
Try mixing it in small amounts with different flavors or pass it on to someone else. Unfortunately, many of us have collections of e-liquid that cannot be used..
Check the Halo and Australian forums for suggestions.
Halo
Australia - New Zealand Forum