No auggicwnt information

I took life insurance/cover in August before the 15th I had my medical done. The gentleman that assisted me asked when I want the policy to start and I said the 1st of September I asked when they debit date will be and he said the date I choose I gave him that date and to my surprise I was double debited, another gentleman called and said I missed a payment and then asked how because I was not told they they will debit in advance and my cover only stated on the first so why am I paying for august and if you say you debit in advance surely I could have been debited in August as per the date I selected for debit. This morning I got an email that it lapsed, the gentleman didn’t come back to me to tell me why I was double debited as we stand I don’t know anything but the fact that it’s lapsed, not at all impressed especially with the last gentleman because he said he will get back to me the least they could do is explain and apologize for giving me the wrong information