Hisense's horrible customer care and poor quality products

My mom bought a Hisense phone within 2 months of having the phone it froze and was not working, she took it back to where she bought it, they sent it for repairs which took about 4 months . When she got the phone back i worked for about a week and went back to freezing again, she went back to the store and they said they will have to send it back again and refused to refund her or give her another phone. Now she must wait another 4 months or more for them to fix the phone by the time it comes back it will be out of warranty and probably still wont work. Since Hisense has failed to fix the phone that she has only used for 2 months and has spent about 4 months without a phone while waiting for them to fix it and is refusing to give her another phone since the phone they supposedly fixed is still faulty.!!!!