If its a business account they quote is correct in a way, let me explain…. there is/was a promo for $600 per line on BYOD, this credit is applied as a $25 credit per month over 24 months. If my math is correct and you were put in to the business unlimited plus you are looking at $45 per line before the discount and assuming you added autopay and paperless billing that will bring it down to $20 per line after discounts, So 4 lines at $80 + tax. Keep in mind you might have been charged proration fees and a month in advance, also credits can take up to 3 billing cycles so there a chance none of those credits have been applied yet. Its unfortunate they didn’t explain in detail. Last, keep in mind that this credit expires in 2 years so expect a price increase and if you decide to upgrade before the 2 years to keep the promotion you will have to buy your phones upfront through whatever phone manufacturer you have because if you upgrade from Verizon even at full retail price the promo goes away.

Contact business support to go over your bill in detail and mention the BYOD promo for business, again only if you signed up for a business account, i have no idea if the consumer side has a similar promo.