I just got a pop-up whilst browsing the web at home on my phone (I have Spark). I'm pretty sure I didn't click anything but something caused me to go to this location (remainder of URL removed).

mustbeyourluckyday.b2beserver.club

Text on the page (with Spark logo):
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Monday November 5, 2018

Dear Spark customer:

Congratulations! You are one of the 100 users we have selected for a chance to win an iPhone X, Samsung Galaxy S9 or iPad Pro.

OK

Rewards program
Congratulations!
We would like to thank you for being a loyal Spark customer!

Every day we select a small group of users and offer them the opportunity to receive gifts from our partners and sponsors. This is our way of thanking you for choosing Spark.
It will not take more than 30 seconds of your time.

You can win a Samsung Galaxy S9, iPhone X or iPad Pro. All you need to do to receive a gift is to answer the following 10 questions.

Remember: 100 randomly selected users received this invitation. The number of gifts is limited.
You have 0 minutes and 00 seconds to answer the following questions before your gift goes to another happy user! Good luck!
What device are you using now?
PC / Notebook
Smartphone
Tablet
Other
© Spark 2018

Conditions
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Naturally I did not click ok.

I have called Spark to check if this is legitimate (although clearly I have wasted too much time and missed my chance), but they are busy and I have a callback scheduled.

Anyone else seen this? Is it a scam? Is it legit?

Naturally I want to avoid malware hijacking my internet connection, but if this is legitimate I absolutely DO NOT WANT my ISP hijacking my connection.