Has Virgin Ever Reduced Your Broadband Speed?

We have noticed recently that Virgin have halved our upload speed and the wifi signal ia no longer good enough.

I renewed my contract recently online and was given to understand that  everything would remain unchanged.but it hasn't. For years I've been uploading data weekly using filezilla at just over 3mps. Now that is halved. 

Possibly coincidentally the wifi signal will now not reach a laptop which has been happily used in that position for years. 

Of course these days with little or nothing in writing it's carte blanche for unscrupulous companies to ride roughshod over consumers.

I hope that isn't the case here