SGQ Processing Put 300 into my account unauthorized now they continue to deduct $90 2x a month unknown, Internet

SGQ processing deposited $300 in my account in October. Ever since I have tried to call them to find out who they where and why they placed money in my account. Then I have noticed I have been getting deductions for $90 ever since so They have taken out $360 in deductions. I contacted my credit union about all of these unauthorized debits and deposits. They do not answer the phone the mailboxes are always full. They Rep just start replying to my emails and is not acknowledging that they have done this in error now she says contact collections which has no answer adn voicemail is full. I am being sent to collections for a debt I did not even authorize then they even got their mone back plus $60 on a debt that I did not authorize. This is Robbery and they think it is legal. This is not fair. I dont know how they got my information to even have started this. Please help.

Lavonne Naperville, Il