If you walk-in to TM center also didn't get the plan you wish, you may find a most suitable plan from other ISPs and sign up for it.
Then, you'll need to wait for TM to give counter offers or request a plan that you knew with someone number currently subscribing to that plan. Just in case, TM don't offer any plan you wish, you may as well go with other ISPs.
Most ISPs will tend to give offers once your contract is over or about to. However, TM is the only ISP that tend to delay in providing offers.