Battery problems persist

In September 2014 I purchased a Samaung Galaxy tab from Incredible Connection Bayside. In December it started giving problems with the battery not charging and loosing charge quickly. Beginning of January 2014 I took it back to the store for repairs. Two weeks later they phoned me to inform me that the unit is back in the store but they are sending it back to the repair centre as it is not fixed and still giving the same problem. This past week we collected it only to find out it is still not charging properly. This is very dissapointing considering that every conceivable electronic I own is Samsung. This service is unacceptable and in my opinion the CPA should protect me. After some time they will have to replace. .