Netflix complaint: charged for a wrong service and twice in a month

It is almost the fifth time someone use my account. The last time,I decided to call Netflix to ask them how to solve the problem and the assistance proposed me to cancel the account and create one new with three month free of charge. We created a standard account like the previous one.
Today I find that Netflix charged me with the $4,42 on Feb 17th (which was right) and another debit in my credit card charged on 29th Feb of $9,31 (which is wrong). This last amount is wrong because my account was a Standard one. On the other hand, the assistant told me he had cancelled my previous account. I still dont understand why this charge.
So today,when I called Netflix again, they told me the previous assistant hadnt cancelled my previous account and thats why I was paying two. I am terribly disappointed because now ,when they cancelled my supposed previous account, the account said it was a premium one,which is wrong. My account is Standard.
That means today I have to pay for services I havent required.I am terribly disappointed since the company made a mistake with the assistance but they charged me anyway.