Telkom refuses to give me my deposit back

I have made numerous complaints on every social media platform. I am always told to send my information and promised I will be contacted. They never contact me. Are the only people working at Telkom the people who man Facebook and Twitter and HelloPeter pages, instantly replying with a truck load of lies? Why does this have to be the only company that we can get landline service from? Their monopoly allows for them to be completely useless ********* and I hate them with every fibre of my being.