The cheapness of champagne

Brought a bottle of Советское Шампанское/Sovetskoye Shampanskoye - Soviet Champagne - in my local supermarket for about 200 rubles (4 pounds/4.5 Euro/$6) last week. Made sure it said dry/brut/брют as I have been told that the local preference is for very sweet; and found it both very cheap and very drinkable. (Although this may be in comparison to the wine, which is generally both overpriced and dreadful).

So bought another bottle yesterday, and as the photograph illustrates, had a series of difficulties opening it. Was even reduced to searching websites when the cork initially refused to 'pop out' and found one forum where a group were arguing increasingly more aggressively in textual form -  for what felt like hours - as to what was the best thing to do. When I tried  some of their advice, which was to run hot water over the cork, the result was that the rounded top just pulled off. So then I resorted to a corkscrew, only to find that the one in this flat is one of those that has all the appearance of a corkscrew but is actually made out of metal-coloured mud, which just bent when I even showed it the cork, and then got completely stuck.

As you can see, this bottle remains unopened, and any suggestions as to what to do next are welcome.