Customer service very poor

On the 28th of October, I visited Mr price clothing mall of africa to buy clothes, I bought the clothes, left the store around just after 8pm and the store was already closed. Cashier asked me if I want a slip or sent to my email, and I said email.The following day I was going to cape town. One of the item I had bought on the day was a denim short unfortunately when I got home it didn't fit nice and since was not available due to work, I couldnt go return immediately. On the 21st October I visited the store to return the item, I went upstairs it was around 7pm,the cashier asked how pair of Jean did I buy and my answer was one, and she told me on the receipts it's two, she then called another person to come assist, the lady said to me there is nothing she can do the store manager is not on duty, I should come back the following week. The did not take my details, or even ask me if I will be able to come back,. First of all I used my petrol to go there, I don't get chance to there,the cashiers charged me for two jeans which I bought one, how is that my problem? Had I not returned the Jean, I was not going to find out.. I am not happy at all, the level of service is very poor, Mr Price owes me and how many clients experience that without noticing.. A whole store operating without a manager and customers are turned away, so if there are complaints and it need to wait because the manager is not on duty. Mr Price disrespects and don't care about their customers. I would like to question about their complaints process, don't they have a process in place that their staff need to follow...so disappointing. I have been busy during the week that I don't get chance to ho back and resolve, again I have to use my petrol because they didn't even bother to ask if I stay far or not. I didn't even need a refund, I was exchanging but did I, NO.