What should I do if I mistakenly selected multiple entry for my Thai visa application instead of single entry?

Hello everyone I just applied for thai visa it's submitted processing but pending payment. I have not paid anything. I selected for single entry but it shows option was selected for multiple entry and fees showing for multiple entry. What do I do know? There's no option to delete or cancel these applications. How do I tell them it's for single entry and I want to make payment for single entry. I wanted to delete all and do it from the first again but there's no option. Please help.