Ryobi Failure to honor warranty for bad battery/charger

In May 2017 I purchased a Ryobi cordless string trimmer and leaf blower combo from my local Home depot. After a few uses, it stopped working and the battery failed to charge. In July 2017 I sent a new battyer, but this replacement also failed in a short time.  After contacting Ryobi again, I was told a new battery could not be shipped until Nov. 2017, and it would be faster to take it to my local Service Center.

So, I did take it to my local Service Center in Aug. 2017 (note that the "Service Center" is just a local lawnmowver and general repair place which also handles stuff for Ryobi). I was told they would have to order a battery from Ryobi, but as I assumed they could get a battery faster than me, I left the items with them.

As I write this, it is now Dec. 14, 2017. I just called the Service Center and they told me that they still have not received a battery, and they were told that an initial shipment of replacement batteries would not happen until Dec. 27, 2017, and that they would not be receiveing any batteries until the shipment after that (maybe)! According to the service rep.: They talked to the Ryobi representative, and told her that according to the warranty I was entitled to a full replacement. The Ryobi rep. said they would not do that, and that she would call me personnally (I never got a call).

My assumption at this point is that Ryobi had a bad run of batteries, and now has a huge backlog of failed equipment which they are unable or unwilling to address, and they are giving their customers the run-around about getting warranty service.