Horroble customer service ever from Manager

I bought a speaker from Cash Crusaders in Sanlam Plaza, Bloemfontein CBD, on 12/12/2020. On Christmas the speaker was malfunctioning, volume was going up and down by itself, so I returned the it on 29/12/2020 and I was told the the process to have it fixed normally takes 3 weeks but due to Covid I should come 1st week of February. I went on the 6th of February, I was told the speaker is still with the Headoffice, I went on 13th February and the speaker was ready, we tested it and it was still malfunctioning, the I was told that the new stock was coming Wednesday, Manger said I will get a new one. I went back on the 21st I was told Manager is no in on weekend, on the 6th I was told no new stock arrived. I went on 13th March, the guy who have been assisting me was on leave, the new guy went to manager and I was told that the speaker still went for fixing, I was not happy as there was no trust that it will be fixed as it was supposed to be fixed long time ago. I asked to speak with manager. I was called to his office, when I get the I explained myself, he told me that I'm not going to get a new speaker as he's still waiting for credit from headoffice. I told him that now I'm hearing 3 version of the story. He rudely told me that I should lower my voice, I told him about different versions that in hearing, he told me he's not going to help me if I don't lower my voice. I told him I not rising my voice, where money is involved the emotion gets high, he told me that then he's not going to help me. i took my phone trying to call my wife to come, he told me I can call who ever I want even consumer tribunal..he's not going to help me. I was so angry that I could not speak so I asked him to speak. He told me that they are selling goods on behalf of head office, so it head office that is failing to honor the warranty so he is busy asking for credit so i can be refunded. I was confused even more. I felt naked by the manner the Manager spoke to me without any empathy. it was like he was doing me a favour. The manager told me that I'm not the only customer that is complaining , he shown me a cellphone that is not working and still blame the headoffice.