new contract , lose all old data and call balances

I have just been to upgrade my contract, was about to sign smart M, with a new iphone 8, replacing existing Smart L contract. Was told, i would be billed pro rata for both contracts, but all data and minutes from old contract would not be carried over to new contract and would be forfeited, This means 286 minutes and 861Mbs of data would just be given away even though they have been paid for. I use so many minutes, because we drop calls so often, then i get a sms on a saturday saying i can have free calls to Vodacom numbers till 12pm on Sunday night, whoopee, i use my phone for business, which does not operate on weekends, Still will drop the calls in any case. I have had this number for 23 years now, and this is the end,you guys just rip the paying public off, how can we lose something that has been paid for? Besides that when are you going to sort the signal out at our suburb, 4G just a block away and not even 2 bars at my house. Thanks Vodacom, for all your support, seems like a very 1 sided affair