I'm sorry to hear you're having problems with your upload speeds. The last speed test you completed shows a much faster upload speed. Was this speed test completed using a different device?
I've completed a line test and the upload speeds looks good. Please can you run some speed tests when connected directly at the BT Openreach modem in a wired state so we can see how the speed compares.
Apologies, I'm not sure why the upload speed would differ between PC and smart TV, if you are connected wired.
Our Community Members may be able to offer advice in regards to this.