Faulty wireless home internet

3 months ago my dad was called and offered this “amazing” deal from telkom,they would remove his ADSL and offer him a wireless solution with all the same benefits for the same price. It’s now 3 months later and he’s still struggling,the connection(when it connects) is horrible. Every time he calls in he’s told his data is depleted yet they cannot make use of the internet. The adsl wasn’t the fastest and wasn’t as fast as his mobile data but it allowed them to access the internet.All he wants is his adsl to be reconnected,his existing telephone number reactivated and this horrible wireless “solution” to be removed. He cannot afford to go stand in long queues especially during this pandemic as he’s high risk. I don’t even think a proper coverage check was done for this,it was all about closing a sale. This needs to be sorted and I’m expecting some sort of credit to be passed for this inconvenience.