Misleading poor service

Signed up for uncapped ADSL last year. Took an uncapped 10mb speed line. Worked great and had no real issues, until I got a call telling me that they would be moving all customers over to LTE. My first question was what would change other than going wireless and i was assured nothing would change. Immediately after moving over i started experiencing poor network, sometimes testing 2mb per second speed. This defeated the purpose of paying for a 10mb speed line as you could hardly watch a movie without it buffering the whole time. Yesterday i made contact with techinal team and was advised that my fair usage was exceeded which is now 150gig. Not wjat u signed up for, initial contract had pribably tripple that. I was asked to call customer service which you wait and wait and wait and no one answers. I have also seen that people are able to still take out ADSL lines which i was told was moving away. This is really misleading and the LTE changes should have been brought to my attention. Overall very dissatisfied with service provider