Disappointed Telkom customer

I would like to express my disappointment and frustration that this company has had on me. 4or 5 days ago my phone stopped working, the only thing I was able to do was to use Wi-Fi and go on WhatsApp. I went to IStore to have it checked out and because I bought the phone from a Telkom store they alerted me that according to apple there is no problem with the phone Telkom is the one that blacklisted my phone. To my knowledge a phone cannot be blacklisted unless the customer calls to say they must blacklist the phone, I did not call Telkom to do such a thing. I bought the phone from them in 2018 and I've never lost it. I am so angry because I hardly got the help I needed and no explanation was given. I was told I need to bring my proof of purchase and I am really upset that I have to run around when it was Telkom's negligence from the start. I feel like they were sabotaging me because I use my phone for everything, from my school work to my work information. I regret moving from my previous network provider because since being with Telkom has been a nightmare. I am not happy with the data offers, the way the data finishes especially when its contract and also the service in most area,, you constantly have to restart your phone just to get coverage. Telkom has **** to me about providing me with the level of service I pay for. my phone is even insured with them and I regret it all now. I will make means to leave this network provider. I'm angry and full of rage.