Please allow me to clarify.. You have misunderstood the information given to you from the telesales team.
It is true that the current plan you have which is known as Fibre Entertainment Bundle (FEB). It includes miotv, home digital line and fibre broadband.
The telesales CSO was trying to say that the current plans singtel is offering is known as Fibre Entertainment Bundle+ (FEB+).
FEB+ is also the same FEB, but it includes singtel tv instead. In order to form FEB+, you have to select any fibre broadband speed (e.g. 300/500/1Gbps fibre) and then another singtel tv pack. For your case, you cannot select a broadband plan which is lower than your current plan during contractual period. You may do so after your contract ended.
You are definitely not required to make it a compulsory FEB+ after your contract ended. Of course, your current FEB will be disbanded after your contract and you will be paying prevailing charges.
If you wish to remove the miotv, you have to do it after your contractual period, while you are eligible to upgrade to FEB+ after 21 months through your existing contract.
The only down side is that you will forgo your annual handset upgrade eligibility should you not recontract to FEB+.
Therefore the bottom line is, you are not forced to take up anything extra or forced to change any plan during your contractual period. Since the old plans are obsolete, either you take up the current FEB+ to continue enjoy multi-line discount + annual handset upgrade, or you can change to a fibre broadband plan without any penalty after your current contract ended.
I am also the same as you, but i choose not to recontract for FEB+ as i will save more without the singtel tv, moreover no one watches singtel tv in my family anyway.