Poor service

Hi. I ordered a clutch cable for my Suzuki and told will take 21 days. Now I have been told today 21 working days. That is not what I got told. And the way I got treated, is very bad. I got told, I am wrong, we tell customers 21 working days. Since when is a customer wrong. I am concerned, that when a vehicle is out of warranty and service plan, then a client get wait for parts, that agent only can supply. Even when I paid for the part, got declined 3 times, and the person behind the counter only read, Declined, and told me your card declined, as if I had no money in it. 3rd attempt, he read, system off line. No where in SA a cable is available, unless it breaks, and some companies can make one up. Now the part will only be in SA between the 19th to the 22nd December. Very poorly handled.