Bad service

so this is an ongoing story. i bought a "new" motorcycle battery at motorcycle world parow on 12 december. they gave me some chinese make battery, but seeing that its a new batry, i took it. battery hasnt worked for me since. i took it back to them on the 23rd december, they charged it and gave it back to me 2weeks later. waiting on them now to see whats next. but they dont want to refund. really Bad service from them.