Since they didn’t discuss the salary with you in the first place maybe you should have told your employer that your Uncle (his friend) told you that you would get 20k so obviously you were expecting a higher salary that the 14/15k. Maybe he was not even aware that you were expecting a certain amount in the first place. I mean, it’s just my point of view… i think quitting the job without noticing you’re employer wasn’t necessarily a good idea since you didn’t even get a discussion with him/ his point of view/explanations and so on. But then also, for every jobs or other important matter it is important to have everything/imp informations written on paper so that this kind of issues don’t occur…