My apologies for not speaking German. So I want to increase my Telekom connection speed to fastest possible. So when I am at customer centre (https://kundencenter.telekom.de/kundencenter/anschluss-tarif/index.html), I get the following options:

Clicking this leads me to the following page (I do the availability check and it seems all speeds are possible):

Now I click  and select my bandwidth of choice move forward and I am presented the following page:

This is the part that I am concerned about. Shouldn't Telekom automatically know I have a Speedport Smart 3 already (as it seems to offer me one while upgrading my bandwidth)? I am simply scared if I put this in my shopping cart and proceed to order I will just have 2 parallel connections instead of upgrading my existing connection to a faster bandwidth. Please let me know if this is a misunderstanding. 

TL;DR: I really want to upgrade my connection speed but I am not sure how to do it online. I do not want to order redundant connections, rather increase the bandwidth of my existing connection. 

My thanks and regards.