Telkom does not know what they are doing

Their service is terrible, I tried opening a new contract with them, but was not able to received the OTP link to my bank. I went to my bank to change the number that was link to an alternative number on Friday and phone again, spoke to an agent who advised that the number has not been updated on their side and the same with take 24hours and i must try again on Monday. Called again this morning and spoke to a different consultant who advised me that it takes them 3 months to update a number on their side. Which I do not fully understand because I am not an existing client and don't know how they would have my details saved on their side as everything i phoned and spoke to a different agent i had to being the process over. The number they have on their system (Which I had initially gave them) was recently updated so therefore if it truly takes up to 3 months to update the numbers n their system they would not have picked it up, they would have seen the number that was lost recently.