you are having a hard time and as you said that its not been a pleasant interaction with kids but pls try to understand them too....these kids are brought up in a way that its not only their fault if they behave this way. Some time complaining to the parents wont even work because the grown ups are worst than the children.
These kids are not allowed to play elsewhere and their parents donot take them for outings normally. The worst part is that even they cant play football at cornish anymore (cause security there wont let any one play with the ball there)