Horrific service from Telkom

I would like to make a complaint against Telkom. I had recently upgraded on my telkom account and I took the Samsung Galaxy Note 20. I went to durban central and was ****** of my phone there. All of my passwords and information was stored on that phone. I couldn't access my emails because i forgot my password and it was attached to my telkom number which was in the ****** phone. In this time I lost my job. However when I went to telkom umhlanga to make payment a few months later for my account which was in arrears since I lost my job, I was told that my account was canceled, without me being made of it. I told them I have the full arrear amount, but they did not listen to me and then gave me a bill for over R20 000, charging me for the phone. Is it lawful for them to cancel a contract without the client knowing that was the case. If trying to call me or even emailing me hadn't worked could they have not sent me a letter to my address to let me know. I mean why cancel a contract without accessing all avenues of communication before doing so? If my address was not available it would make sense but they did have my address. And to refuse R6500 and say we canceled your contract sorry..you owe us over R20 000.. shocking. I told that lady at the head office I'm unemployed but she told me sorry there's nothing that they can do. Now they have listed my information at the credit bureau negatively, but my question is..have they handled this properly. I don't think so.

H.Narayanan