Vodacom refuses to upgrade my home internet speed I'm willing to pay more money

I have a 50mbs home internet package with Vodacom I'm finding the speeds slow and wanted to upgrade my package to a 100mbs line, Vodacom is saying it's not possible to upgrade my package I mean what the hell I'm willing to give them more money but they don't want to upgrade me what terrible business is this.They keep giving me the excuse we can't upgrade you only in November 2027 this is absolutely nonsense I must sit with slow internet for nothing