F.Fortuin..please resolve it

Hi this service it's poor can you please assist me to call this company in Christiana...cos we bought a battery of a Willard 622 last week and it was not right and we try to change it...and their invoice it's saying within 7days we can bring it back... invoice nmbr 2244205.... contact nmbr 0534412235 at the parts....they don't want to....