AT&T DSL Promotion Issues

Raymond ***** Hi-Speed DSL Long term Customer. Account No: *****

For the the past four three months AT&T Retention Department has given me 3 separate Promo prices, starting with $27.00, then $29.00, and now in March 2017, $34.00. Today I get a bill of $79.65 due 4/26/17. I am on a tight budget, and trying to remain a AT&T customer, but I can no go through this aggravation each month. No two AT&T reps tell me the same story. Please look into this matter, because I am going to cancel all further dealings with AT&T at the end of April 2017. This is a very dishonest corporation, and I am through with months of employee lies. Thank you for your attention to this matter.  R. [edited for privacy-please do not post personal or unique information such as but not limited to full names, employee ID numbers, email addresses, phone numbers, account numbers, etc.]