50 GB of data is not likely to be suitable for general streaming usage such as Amazon Prime Video, Netflix, or Disney+. Even the 200 GB contract I'm on will be pushing it as my monthly usage can be over 300 GB.
This being said, I think it's unlikely you could use up the full 50 GB in two days as that is almost eight times my usage rate of roughly 6 GB/day so I think it would be useful to keep an eye on your usage throughout the day to see what is responsible for most of your data usage (my watching of Amazon 4K UHD does not eat up data at that rate although I did manage 15 GB and 16 GB over a weekend so I guess I'm not that far off).
If you are within a 14 day cancellation period, it could make sense to cancel the 50 GB service and to find a more appropriate service provided by EE (e.g. 200 GB data or unlimited data).
