Telkom is a bad service provider, a **** so to say...

I took a contract with Telkom for a MacBook and our agreement was that I will be debited an amount of R705 pm. All has been well, until in February when I when to Istore at Maponya mall and I wanted to add an iPhone 15 the agent that assisted me said it could not be processed because I was unable to accept the mandate. I left the store without the phone and the process cancelled. Now every month I receive an invoice that I own 2 handsets (MacBook and iPhone 15) and I have called in every month to explain to them that I only have MacBook which I pay for on time and have never skipped a month so they must remove the other item attached to my name cause I don't have it, every month my account is suspended and the reason is because of arrears, this saddenes me because I have worked hard to build a good credit profile and I have never skipped their payment. Today I called to their contact centre, and all 4 agents were unable to assist me. Agent 1 transferred me without my knowledge and agreement, agent 2 was unable to see that my account was up to date, agent 3 said I should hold and eventually hung after more 5 minutes holding and the last one said I will receive a reference number to confirm a service request log and I haven't received it. I am tired of having to call in every month and explain myself, I am tired of my account being suspended when its up to date, I miss important emails and messages because my account internet is stopped for days and end...if it was upto me I would cancel the contract and start with another service provider that is competent and efficient. It is my first time using Telkom and the service is horrible really, even the lady at Istore in Maponya Mall is to blame for this because she's aware I left the store with no phone but I am not sure why does the system want to bill me twice.