Vodacom fibre having an old deal and old modem

I app**** for Vodacom fibre in October 2020. And would have heen live in November/December2020. But I cant blame Vodacom for that for they dont install the fibre line. Problem is at the time I app**** for the bottom package was a 10/10Mbps. Now the lowest is a 15/15Mbps. But No one seems to be able to help me to get it to the 15/15Mbps package. Vodacom has always served me well but now im stuck with this 10/10Mbps and now im wondering must I cancel and select another service provider. Just wish they could help me out. Atleast Vodacom sorted the duplicate order for me.