Zero Customer Service

I am disgusted with Vodacom's lack of customer service. I have been a Vodacom customer for the last twenty years. I have always had many contract's with Vodacom. Recently I have not needed those contracts/numbers on my contract. I have been in to the store to cancel/or remove the numbers and contracts from my account. There is no customer service in store. No one is able to assist. I am then told to call the call Centre. I then waste many hours on the phone speaking to a machine to try and cancel the unused numbers on my contract. I am aware that there is an outstanding amount on my contract. I would like to pay that amount but every time I try to pay it Vodacom adds interest. I am going in circles trying to sort this out. I would like to downgrade or cancel my contract due to the lack of service that I have received. Please can someone call me and assist me immediately.