2 Weeks later Mecer notebook not working now WAITING!!!!!!! NO FEEDBACK FROM THE STORE!!!!!!

We purchased a Mecer Xpression Notebook from Cash Crusaders Edenvale Stock number ***8 Mecer*** on the 24/12/2019 the sales person who assist myself and my husband was Ziyanda Sithole. The notebook was purchased for my son for school and we asked Ziyanda before purchasing that should something go wrong with the device is there a guarantee and she circled the back of the receipt saying that there is a 6 months warranty if something goes wrong they will either fix or replace it. My son started using the notebook when schools opened on the 14th of Jan now barely two weeks later the thing does not want to go on or charge. We took the notebook back to Ziyanda on the 01st of February and she advised that they are going to see if they can fix it they will call us the Sunday. No call!!!! On Monday no Call!!!! on Tuesday the 04th of February my husband Mr Miller went in to the store to find out what is happening as my son needs the device he is now getting ****en delayed in school due to there stupidity. When he got there Toyondo advised that they are still busy with the device and she will call him even took his number and added it on her phone yet again still no feedback. I want no further delays with this notebook i want a replacement for it. My husband drives all the way from Auckland Park to Edenvale just to be turned away no assistance what so ever. I WANT A REPLACEMENT AND I WANT FEEDBACK FROM THE MANAGER TODAY....