Extremely high data overage charges

Hi! I am hoping to get some help regarding the extremely high data overage charges I've been getting for multiple months in a row now. I am on the 1.2 tb monthly plan, and selected it because the rep strongly assured me that it would be sufficient after describing our households data needs (2 regular non 4k non HD whatever whatevers, just regular cheap o tvs, one ps5 used for games, one Xbox that is only occasionally used for fortnight, and one tablet used exclusively for watching YouTube ). The rep stated that 1.2 tb is well beyond what the vast majority of customers use and my households usage of our tvs and devices is very much within the range of what you could expect in just about any home these days if not less than many. And yet I have ended up with multiple months in a row of over $100+ in extra data fees. I do not understand how or why, but I simply do not have the funds to pay these crazy high fee laden bills each month. And to be honest, im feeling some type of way, if you will excuse my use of colloquial phrasing, about the fact that the only reason I opted to go with this specific plan is because the rep greatly assured me I wouldn't have a problem with the kinds of usage we typically do exceeding 1.2 tb. I'm wondering if there is anything we could possibly do, for example perhaps if I changed my plan to the unlimited data plan going forward, could you perhaps make it retroactively apply so that I can actually pay my past due bill, get my account back in good standing, and keep it that way going forward?