delivery like always wrong information just to get customers really annoying

correct Form
i made a contract it says Handy exist ,and after 10 days it says Handy not available, so if its not available just write not available, but dont lie on customers just to sell more contracts.
and what makes it more confusing and annyoing is that i called and asked the employee about where is my Handy first call i made was on monday from 3 days and they said tomorrow it will be in delivery so here is the first lie .
so i waited and nothing i called wednesday i said nothing happened so please when i will get my phone and they answer yes sorry today at night you receive email or thursday with tracking number , so i waited and nothing happened Second lie , so i called today and the Information i got so different from all others they said to me is not available and ill have to wait and they dont know how much so at first its written at your AGB 10-14 days and than yes sorry we dont have it please wait ha???
what is this how you could do that make contracts with phones that they dont exist in your Office and they are out of stock but on your Website it says they are available is this even legal here in Germany ? , how could you do that ?
and by the way if this happened the first tine ok i might understand but nop this is the second time you do that with me and i even noticed with lot of customers too for the first time i waited 38 days OMG but this time ill handle it in different way unless you find me a solution really because its really annoying and what your doing is i guess ilegal ill have to ask a lawyer about it so this doesnt happen with me or other customers again
thank you so much and hope you understand my problem
Best Regards
El-Youssef

Thanks MARIO for your fast reply
But unfortunately the same what happened with me first time and I get the same reply that I got for the problem happened with me from 9 monthes
So simple question : why you do that and later ask me to cancel or make new order , why you just not try to be honest with customers and give them right information but no you don’t you wait untill order is taken and after that you say ja sorry we don’t have it anymore you have to wait.
so if I want to change my order to a different phone which is available now and can be delivered now so how much time it takes for that and how can I do that , and what’s important is i have to cancel all order and begin with a new full order processes because if so no I don’t want that solution I only want to change phone even if I pay more ? Nothing else and that is directly now send to me this would be awesome and great
Thank you
Best Regards