48V 20" Brushless Push Lawn Mower

I purchased this lawn mower back in Aug of 2021. I have used this mower constantly without a hitch until now. I need to replace the blade and found out there is no replacement blade for this mower. I searched online and found other people with the same problem. After spending 30 mins with customer support, I was told nothing was available. I then asked how this mower could be currently sold for six hundred dollars, which is 150 percent more than what it cost me 2 years ago. Only then was when I was told of a replacement part and its availability at an authorized Greenworks part dealer. Greenworks sent me an email with a link to the vendor's online store and part. The part number that the email link led me to was part number # R0200742-00. I will not mention who the vendor is only because the vendor has no fault in this. But they do fail to provide specifications for this part and only provide a picture which does look like the part. At this vendor, the new part is priced at $70 with shipping which I found to be an insanely high price for a lawn mower blade. I feared that this new part would not fit on my mower, and I did not want to through away $70.00 so I searched this part number online and discovered that this part is 21 inches long and the mower uses 20 inches which is clearly labeled all over the mower. So I am finally left with no available part and erroneous information given by Greenworks support that could have cost me $70.00. I have no choice than to try to sharpen the old blade. My advice to all is not to buy any Greenworks products. When you start charging $600 dollars for a part that listed for $400.00 two years ago and provide no support or replacement part then you do not deserve to manufacture or market any products.