Store damaged our goods

In 2019 February we went to best home and electric with my girlfriend to buy a TV,we bought a 49 inch hisense smart TV and paid it up by May 2019,on the 20th of June 2020 the TV had a problem with the volume and few minutes later the screen went blank and we had to take it back to the store where we were told that it will take a month or two for them to fix it,fine then on the 20th July 2020 we had a call from the store about the TV and we went on the 21st July 2020 and when we got to the store we were told that the screen had cracked but the inside part,how I don't know but we told them that when we brought the TV to the store the problem was with the volume nd the blank screen and now they are refusing to replace the TV as it is still under guarantee they say its the customer's fault,the store is"best home and electric"in vereeniging a d their branch number is 0718