Saying goodbye on the Phone with ah Kuen

Kuen " so they will be patching up the wall soon ......maybe next week..... have to wait for the fifth floor....
... (8 minutes later) ..... just to let you know I will be making the chicken this year .......

Me : " mom I have to get back to work , we can talk later "

Kuen:  " ......click .....

Me:  " mom? " mother ? ah kuen? "

>>>>>calling her back ......

Kuen:  " mut yea ah" (what)

Me:  " why did you hang up on me "

Kuen:  " you said you have to go back to work"

Me:  " can you please say bye next time, I hate it when you just hang up "

Kuen:  " i have to go .....click........"

me:  " ARHHHHHHHHHHHHHHHHHHHHHHHH"