Telkom Disaster

On 22August 2019 I took out a contract with Telkom Cape Gate for a Samsung A50.Not long after the phone overheat and cannot switch on.14 September 2019 return the phone for repairs.Never used the phone but payed R565 month end which means the contract R299 so pro rata R266(never used the phone).To repair the phone I must now pay R678 and to cancel the repair I must pay R189.The manger of Cape Gate branch admits to the fact that the problem is a Samsung problem.Asking why not give me a new phone I was told this broken phone must be repaired 4more times before they can give me a new phone.To cancel this contract will cost me R800+another month's pay R299.I am so disgusted and dissatisfied with the treatment I am getting so far from Telkom never again.Please help me get out of this contract just costing me more money and trouble. I'm at wits end