Poor telkom service to resolve billing queries

I have a billing issue. They sent me an amount which I paid directly into the account. I keep getting a SMS saying i owe 447 for a rejected payment. I called in to find out what is going on so that I can either pay this or get it credited by them as this was one the last time when this happen. I've been with telkom a while now and all I want to do is get this resolved. I called the call centre and spoke to Pearl Mbali Ntuli who left me on silent for 3 minutes then proceeded to drop the line. This is unacceptable and needs to be addressed immediately. This is gross misconduct. Please get back to me with a resolution. My contracts are almost done so if this nonsense persist I wong upgrade my iPhone 7 or my iPhone 8 and I definitely wont be renewing my internet connection. That's a R3000 a month customer lost because of poor service