incorrect billing

i have a big problem with Telkom and i am read to lodge a complaint with ICASA. I have a cellphone and router contract. The router is for 24 months but when i took it i was told it was for 12 months which really is not an issue, The issue is that when, i inquired about cancellation, i was told that i need to pay a certain amount and from my calculations, i am being charged for the remainder of the contract and even more, same as for the cellphone contract. I am paying via the app but i am always told that my account is in arrears and no one provides me with an answer. After paying my account will be debited more than two times for nonsense! Telkom is honestly a ****!