Twice confirmed telephone is repaired, twice not delivered

My mother phone was out of order from 3/10/2017. When you phone the phone rings and goes over to voice mail. When you are at the house the instrument or line is dead. I reported it both times and new reference number given. How can I receive two confirmation phone is restored and still same issue. The technician was there two times and the with the promise to fix. This is the phone where my mother family contact her on. How many times will this be repeated before a person that actually knows what they are doing fix this. Poor service unacceptable. Below all the responds I received

Telkom SA: Dear Customer, Fault 421CRZ031017 has been created for Service ID ********** 713. Telkom SA: Telkom will endeavour to resolve this problem within 3 days. Please refer to the Telkom app for further information regarding your fault. 03/10/17

Telkom SA: Dear Customer, This is a progress update from Telkom SA. Fault 421CRZ031017 for Service ID ********** 713. Your fault is in hand with our technical repair division. Please do not reply to this SMS. Telkom 04/10/17

Telkom SA: Dear Customer, Telkom will attend to your faulty services shortly. Please refer to the Telkom app for further information regarding your fault. (1) 06/10/17

Telkom SA: Dear Customer your report reference 421CRZ031017 was restored. If the problem still exists please contact Telkom on 10210 for Residential or 10217 for Business Services. Alternatively use http://www.telkom.co.za/sites/contactus/emailus&formId= ********** 128175. Please do not reply to this SMS. Telkom 08/10/17

Telkom SA: Dear Customer, Fault 150CRZ091017 has been created for Service ID ********** 713. Telkom SA: Telkom will endeavour to resolve this problem within 4 days. Please refer to the Telkom app for further information regarding your fault. 09/10/17

Telkom SA: Dear Customer, Telkom will attend to your faulty services shortly. Please refer to the Telkom app for further information regarding your fault. (1) 12/10/17

Telkom SA: Dear customer, We are busy investigating the cause of the problem. Please refer to the Telkom app for further information regarding your fault. (2)15/10/17

Telkom SA: Dear Customer, This is a progress update from Telkom SA. Fault 150CRZ091017 for Service ID ********** 713. Your fault is in hand with our technical repair division. Please do not reply to this SMS. Telkom 16/10/17

Telkom SA: Dear Customer your report reference 150CRZ091017 was restored. If the problem still exists please contact Telkom on 10210 for Residential or 10217 for Business Services. Alternatively use http://www.telkom.co.za/sites/contactus/emailus&formId= ********** 128175. Please do not reply to this SMS. Telkom 16/10/17