Verizon billing issues

In looking at some Verizon bills at work, I noticed we were paying $.20 to $22 per minute to call European land lines, despite having paid for a plan that promised much lower rates. From my home phone I pay about $.03 per minute for calls to Europe. We were also paying about $.11 per minute to call long distance in the United States — higher than a pre-paid phone from T-Mobile. Verizon promised to fix some but not all of the overcharges, but only going back 90 days. This isn’t the first time we have had problems with Verizon. Not surprisingly, all of the errors in our bill work to the advantage of Verizon, and to our disadvantage. Apparently we have to audit the bill every couple of months (or we pass the 90 day rule on refunds for overcharges).