Billed monthly for new things without knowledge

Terrible service constantly being charged and billed every month with something new I keep calling to cancel and the next month it's something else new I can't seem to understand why I am being over charged every month for new stuff with Telcom, plus they are the only contract service that is charging way more than other networks, this will be my last with Telcom after this I will no longer be using Telcom. I have already paid 4 months for something I don't know off.