Bad service

we have a landline phone that is about 9yrs old now and my mom has purchased a new cordless phone but ever since the phone was bought it has never worked and when we connect it to the line port by the wall there is no dialing code / we even went to exchange it thinking it might be OBF but still no luck till today, we reported the matter and a technicians was sent out to fix it but failed then after a week another tech guy was also sent to our house but he also failed .. both technician's visits to our house was fruitless as none of them managed to help us . can someone from telkom who can assist do so as we stuck with a phone that is not working.