Horrid attitude from accounts

I returned 10 plants on Friday 9th February 2018 as my client changed their mind about them. I followed due process and was told I would have my refund latest Monday 12th February. I called on the 14th February to track my refund and a lady named Charmain in accounts gave me the most horrid attitude and told me that I am not exactly their only client and she had other things to attend to. When I asked what time she would get back to me she said she would do it in her own time this morning the 15th February. She has not gotten back to me. I did not shout at her nor give her attitude, I asked for specific information so I could track my refund yet she treats clients as if she is doing them a favour when it is Central Nursery Depot that owes me my refund.