I was using a computer system that did not support all of the webpages information when...

I was using a computer system that did not support all of the webpages information when signing up for LinkedIn. At the time I didn't realize I signed myself up for a ** day trial for a premium sales account, I thought I was just signing up for a sales account as that is what my job title entails. When I linked my pay pal to my Linkedin account, I thought (just like any other app or website for account usage) it was for any in-app purchases should I choose or need payment for anything in the future. When I link pay pal to websites and accounts its strictly based on the payment coming from the first initial primary credit card I have registered with Pay pal. I did not receive at any time* a notice, warning, etc regarding this random trial I had signed up for. ** days after signed up for LinkedIn I was charged through my pay pal account via credit card a fee over $*** which had bounced of course (unexpected, that amount was unavailable), when I received an email from pay pal stating my account was in the negatives, I looked into the matter further and realized exactly what happened. I then took measures to cancel any future payments from both the LinkedIn side and the pay pal side. Then I received a notice that my pay pal account was due funds of over $*** because LinkedIn went into Pay pal again and this time not only trying to charge my credit card, but actually sent the pay pal through my debit card account with my bank, leaving me with a $** NSF because that account did not have the funds to support the transaction. I looked up online ways to rectify this and contact LinkedIn's support team. In the mean time of all this, * days later, my debit card through pay pal was again charged for with another $** NSF fee due to LinkedIn trying to pull another $*** fee out. This is well after I cancelled all previous transactions on both ends. Now Im dinged with $** negative in that bank account due to LinkedIn not obeying the cancellation requests I had sent through., I am looking for a refund and need to know how I go bout this. I have a screenshot of the transactions, bounced transactions and fee's being withdrawn including the NSF being charged on my account from the bank. How do I rectify this problem and find a solution?