Bad business ethics

I was recommended to MarketingResults based in Pietermaritzburg to do my social media. They quoted me for all social media. I then accepted for them to begin with my update of my catalogue. Before quoting I sent them the latest catalogue together with the updated pictures needed. They did did not request any further pictures or documents. The quotation had to be paid in full before commencement. After 2 weeks it was evident per zoom meeting that they had not done begun on the new catalogue, and the format they quoted on for the finished product could not be done. (I was emailed that they had done 40% of the design). They then refunded me only a portion of my money paid and withheld the balance!!!! I would be careful of using them.