Unprofessional Suppliers?

Friends.. Tell me if i had been wrong... For the past few days, i had been looking for tshirt printers who can give me a competitive rate. Some failed to give quotation, some gave but too high for my budget but there was one who fit in. There were some modifications on the design, so i sent them an email requesting for a quote as their might be a substantial adjustment on the rate. That was thursday. I called them x times on their cellphone, texted them and resent the email for both friday and saturday but they were not replying. So I was under the impression that they are not interested in my business for their schedule might already be full. I needed those shirts on the last week of August so I am panicking already. I needed to close the figures. This morning, i texted them to follow up on the rate as i needed to close the deal today. even on a sunday, i still searched for a supplier and finally got one and the rate was very good! So, i thought.. i guess i wont need the old supplier anyway, they arent replying. Besides, the new one is such a good deal! So, i emailed the old supplier and told them that i have found another one. This afternoon, they replied... with sooo many hate text messages saying, "I am so pissed off at you. How dare you ask me to close the deal on a sunday! I have a family too you know." Like woah?!!! I cant believe this! I had followed up ever since Thursday! I needed to get those shirts going. Didnt they see the messages i left on their phone? Didnt they see the many calls that I made? I explained to the supplier that I got someone else because they have not been replying. I know it is sunday but i needed to close this issue so that I can proceed with my regular work and weigh the budget. Can anyone tell me where I've gone wrong? I honestly find the reply very unprofessional.