Unimpressed

I tradeded in my car and took one that was worth less than mine and was owed cash back which was promised to be paid the following day it's been 4 days and I'm still twiddling my thumbs waiting. The sales person was great I'll give him that the entire process was seamless but now I have to essentially beg them to pay me what I'm owed. This was my 3rd time selling a vehicle and I've never had to wait longer than 24 hours for my money. The administration or whoever is responsible for processing payments is either mentally on holiday or just lackadaisical either I'm extremely disappointed.