Cellphone-BAD Support Service

My housekeeper bought a PREMIO S85 Cellphone 6 months ago, from Ackermans, Humansdorp-E. Cape. The battery has swollen, as well, and does not hold a charge. She has gone to all the Ackermans in Humansdorp, as well as those in Jeffreys Bay, and everyone tells her that they do not keep, and don't get spare batteries for that phone. She has to try 'order it online'??? or go to Port Elizabeth, and maybe get a new battery there! No guarantee! How can a National Store, like Ackermans, stock and sell an item, like this, and not be able to get spares, fix, AND/OR even offer to replace her phone???