Study refund policy Mr Manager

Good day I am disgusted by the response and treatment I received from the manager Marlon at Lakeside pick n pay. I am a regular customer in Lakeside store because walking distance from where I live. I shop for 4 different people ,business shopping and my personal shopping so I am purchasing from pick n pay like 4 times a week so I spend a lot of money at pick n pay. Often I get the brand or size or I buy the wrong item or I bought to much because I do shopping for 4 elderly and business and myself so it's quit normal there Wil be mistakes. I do regular exchanges and refunds in line with pick n pays policy but mostly do it the Lakeside store which is close to me. The manager firstly refused to do a refund of just over R80 today tuna spaghetti pasta flour and spray I had valid slip and goods was paid in cash 2-days ago he said he I am becoming a problem I refund things I explained him the reason and he said what is wrong with me why can't I buy the right stuff wow I was humiliated I.then raised my voice asking him why refuse if your policy states clearly and then he told cashier to refund but not the spaghetti because they don't stock that and he then said clearly to me that this will be the last time he refund or exchange items from me. I will not tolerate this treatment if they had reasons to why he made that statement or if I did not follow policy but I am in my rights. I guess I'm a coloured wonder if I should send my white boyfriend will they do the refund will the rules and treatment be for everyone. Disgusted how customer service has dropped.