You hand me over for your mistake!!

So I have been a client of standard bank for many years now..I recently took out a smaller loan in march as they offered to me and everything went well till this morning..I received a sms stating that my account has been handed over to debt collectors??!! Umm The debt order went off on the 28th of April? So I get a phone call from a gentleman from ver-tex solutions stating I haven't been loyal to my loan which is very upsetting to me as thats the first thing that goes off my account? What now standard bank? I’m sure you gonna lose a client and I will tell everybody I know how bad you guys make a person feel!! For not paying a account on time..3 days from the 25th I might add!! Disgusting and pathetic!!