Extremely Disapointed

My membership was active on the 1st of August 2017 and I was only informed about this on the 7th of August. I provided all my details telephonically, including my banking details. I have lots of debit orders, I do not check who debited and who did not debit, on Friday I get a call that the debit order was declined, when I asked to confirm the account number its totally different from the account number I provided. I do not even know that account number. So now I'm told that I have to pay basically installments for 3 months. How does one person afford such? I cant even afford for 2months, worse because I have to be responsible for your agents capturing incorrect details which I did not provide. Your underwriters refuse to assist, where do you think I'm going to get 3 months premium money from?