Bad customer service from Dis-Chem

I purchased 3 Elektra heat bags the beginning of April to aid in recovery from surgery. Two of the bags was in use. In May 1 of the chargers did not work anymore and was quickly replaced by new one. Since 9 June I've been sending messages via Messenger regarding the 2 bags in use that does not heat up properly, the bags make funny sounds while charging, light of the charger goes off then the bag is still cold but it's because it inflated so much, the charger goes of. I asked if I could take the bags to my nearest branch which is 72 km away to have it exchanged, the response via messenger they can't advise me on that and that I need to await feedback from the team. I keep getting the response I need to wait on feedback from their team. I stay in rural town outside Capetown and it is not possible for me to just drive to a nearby branch. I have been using these bags since 2018 and this is the first time I'm having problems with the Elektra heat bags. Can Dis-Chem please have a look into this.