Damaged my reputation

I was offered a contract by Telkom in Sep 2016 and i accept it after 5 days having the contract i had a trip to Durban where the problem began ,On my way to Durban my boyfriend called to asked if i have arrived then he asked if i activated whatsapp on the phone, my answer was no because it was still new . So he sent a whatsapp message to the number provided by telkom ,asking about the trip the person who used the number on whatsapp was rude n told him that the number belongs to him , i don't know the whole conversation but he called me back and started accusing me of cheating and saying that i **** when i said i got a contract phone he knows that i got the phone from my new boyfriend we argued a lot couldn't enjoy the trip because he said i went to Durban with my new boyfriend. on the 29th Sep 2016 called Telkom to find out about the number spoke to Mduduzile whom explained that my number its share number they will contact the person using its on social media to stop he than said he will sent an email of apology i asked him to sent me a detailed email explaining everything about the share number so that i show that to my boyfriend but email it wasn't in detailed as asked. I called on the 10th Oct 2016 requesting for the email again I was told it will be sent , called again on the 15th Oct spoke to Dipolelo i had to explain the whole thing again worse she placed me on hold for more than 30 minutes till i dropped, I called again on the 20th Oct spoke to Koketso i explained the whole thing to him i asked than asked him to cancel the contract because am not getting any help an being sent from pillar to post he said I have to pay a penalty fee because its bridge of contract but i told him that am not cancelling because i was but am doing that because of the Pathetic Service their giving me he told me he will escalate the matter but never got any response , i called again on the 15th Nov spoke to Chanel she also said she will escalate never got the responds yet they try debiting my account every month and the debit order bunches and my credit scoring had dropped i cant apply for anything i get declined everywhere i go because of bad record . Am going to take this further .