Very bad service from Telkom

I am being sent from pillar to post by the agents from call centre and I don’t know where to find help. I signed up for home unlimited uncapped fibre deal 10Mbps for R499 sometime in May and the application was done over the phone but to my surprise I am being billed for home unlimited uncapped fibre deal 20Mbps for R699. I phoned the billing department to query my bill and I spoke to Thandile Madubedube on the 12th of October who advised me to call sales department so that they can rectify that. I then phoned sales and spoke to Simphiwe Nxumalo who then told me that Telkom has got billing issues and the billing department is aware of it and advised that he put a note on my account to indicate that I have signed up for home unlimited uncapped fibre deal 10Mbps for R499 and told me that the billing department will be able to see that and rectify my account and then advised me to call the billing department. I then got a phone call from Thandiwe from the billing department on the 15th of October who advised me that she has a copy of a contract that I signed in person for the home unlimited uncapped fibre deal 20Mbps for R699 , i am still in shock because my application was concluded over the phone. I then asked Thandiwe to send me a copy of the contract but she advised me that she is not allowed to do so and advised me to go to a Telkom branch for further assistance. I then went to a Telkom branch at Capegatemall on the 17th of October and the consultant managed to go to my profile but advised that she will not be able to assist me since my deal was concluded over the phone, she indicated that she can only assist me with downgrading and advised that I will charged a penalty for that. I then phoned the billing department on the 19th of October and spoke to Thandiwe and gave her the feedback that I got from the branch and she indicated that she can’t do anything from her side and directed me to sales again. I then phoned sales and spoke to Precious Magwai and I asked her to assist with retrieving the phone records, she kept me waiting for long on the line and told me that she had sent an email to the agent who placed the order Rea Sibeko so that the matter can be investigated and promised me that Rea Sibeko will be in touch with me before end of business. As is the norm with Telkom no one has contacted me and it does not look like no one is working on my issue. CAN SOMEONE PLEASE HELP, I DO NOT KNOW WHO TO TALK TO ANYMORE OR WHERE TO GO TO.