KFC poor service

On 5 June 2019 I bought a 21pc bucket and when I got home only 15pcs were in my box....I phoned the manager immediately giving him all details on slip, few minutes later he phones me for same info I already gave him, and he never phoned me again with an answer...next day I go to kfc now needing to explain to new manager who had me waiting for over half an hour checking the cameras...I was so irate because it didn't take me 10min to get through the drive through and he needed over 30min to check...they finally showed me a vid clip of one of their workers packing a 22pc bucket (had to count with them), trying to convince me they were packing my bucket, well I know what I got and I refuse that anyone make a lier out of me...I insisted that it was not my bucket that was packed...my lid could still go down a quarter of that box and definitely only had 15pcs in my bucket, confirmed by those who helped in my kitchen.... None of these managers has not got a worry about customer service... And I'm not worried about chicken, don't want there chicken, I want my over paid money back for chicken I didn't get....Also losing a customer with their poor service.... hope they sort out the staff that doesn't know how to count !!! AND GIVE MY MONEY BACK !!!!!!