No Clue, No Speed, No Service, ***********!!!!!

I have struggled over the last month with line speeds of between 4 to 6MB on a 10MB line. It always synced at 8 to 9MB. It is now Downstream at 6190 and up at 635??? Technicians have come out and tested - line is fine, but is seems TELDOM cannot supply anywhere near to 10MB. 6MB on a 10MB line is not best effort, it is no F*&cking effort. WHY SHOULD I PAY EXTRA FOR LESS THAN 2MB EXTRA????? PHONING THE HELPDESK/CALL CENTER IS A LOST CAUSE BECAUSE THEY NEVER ANSWER - AGAIN ALMOST 2 HOURS ON THE PHONE!!!