iinm so far there are no plans that offer for Tik Tok only.
U can actually downgrade to RM28 for 6GB data + 1GB rollover + 100 SMS + 100 Minutes calls (if lucky they retain unlimited calls)
The only catch is u have to walk-in to centre for this, and it depends on the PIC whether want to offer u or not.

Yup done it twice (2 different number). once at Gardens Mall another time at Sunway Pyramid (or was it both at Sunway Pyramid?)

Its actually RM58 plan with RM30 discount (no contract/perpetual discount) the officer might not understand your request so u could them them u are looking for DG Smart Plan 28(s)