why wait till Monday ?
just call 1688 ...
btw, they have deactivation via sms ...
as in u select the proper options ...
then u confirm ... an sms will be sent to your mobile ...
u respond via sms
either i'm too stupid (cant figure out) ... or the instructions too cheem

(eg '1') :
1 ..........
2 .........
too high level for me ... i replied '1' '2' '3' '4' ...
invalid response
fedup i called 1688 ...
the CSO answered ... like half dead at first ....
just mumbled thru his intro ... catch no ball (must have been a hard day ... with all the SG giving them stick lol)
alas he awoken, and i could hear him clearly ...
the most clear part is ... "Thank You & Have A Good Day"
btw, cancellation is with immediate effect ... no need wait until what end of billing cycle or what (but then again, i think my billing cycle's today ... so u best check wef when)