Bad service

My name is Odette Van Der haar I bought a SamsungA2 core from Ackermans in September 2019 in February 2020 my phone has a message that read device overheating & the phone refused to charge. I took the phone back to Ackermans on the 23rd May due to lockdown after a month u contacted the store to find out of the status of the phone where they sd that they cannot repair the phone as the warranty fell away because the phone has a crack on it.i advised the lady that I did not send the phone in for the crack then she said that I need to pay R800 for the phone.1st they could not repair the phone now they want R800 which I told her I'm not willing to pay.i asked to speak to the manager I was put on hold for 5 minutes in which time my airtime cut off I dialled again then I asked the lady for her name she then transferred the call.i cannot pay R800 for a phone that I bought for R1200.