I've been receiving bad service for more than a year.

Hi. I'm so sick and tired of Telkom. After struggling with them for a year to uplift a device they sent to me accidentally and charged me for that year. I finally got imbursed. Then in July they billed me R524 penalty for services used prior to cancellation. I asked what services as the package was sent back sealed and never opened. I'm still waiting a response. My September bill, I was billed R500 for internet which I didn't use. My account is capped. So why must I struggle and be treated so badly by Telkom?