shudn't tell vs shud tell

Story 1: Shudn't Tell
Just finished my dinner wit my mum n my sis at dome. I brought my sis 2 isetan 2 buy her clothes then only go n meet my mum at kinokiniya. After buying everything v needed, v then go 2 buy a drinks at starbucks b4 goin home. Some more my mum 1 2 hav a look at the CNY cup from starbucks.
Once v reached there my mum went 2 look at the cup n i went 2 take order. Luckily 2day Cyrus starts workin at 5pm so tat i can hav 30% off, hehe =)
After ordered my drinks, Cyrus only asked " U 1 2 buy the cup?" (bcos at tat time many ppl so he din ask me earlier)
Me : but u edi used ur staff purchase wor, not only can use once a day meh?"
Cyrus : Yeh, tat day i hav asked my boss, he said tat can use unlimited times de la."
Me : Yer, then how come tat day ur collegue dun let u use it again de...."
P/S: U shudn't tell me la.... So "ngum kuk" lor...

Story 2: Shud Tell
After back home, feel like calling ming, so i gav her a call.
Me : Hello ming ar.
Ming : Actually now i m at KLCC lor.
Me : Yer!!!!! Y u din tell me de....
Ming : Y, u oso at KLCC?
Me : No la, i edi back... but i edi told u i will b in KLCC ma, u shud tell me lar...
Ming : I dunno ma... Then, I saw Cyrus sittin in front of sushi king alone. I think he finished working ba.
Me : O, no lar, he is having his break, just hav a chat wit him through sms. Yee, u relly shud tell me u r in KLCC lor...
P/S: Ming ar Ming, u shud hav told me u at KLCC la... Then v can hav dinner 2gether ma... Then u no need eat at sushi king alone lor~~