Tet - Horrible service

Horrible customer experience.
I tried to switch to Tet for internet because they currently have a good campaign with reduced price for the first 2 years. The website asked me to pay 100 euros of safety deposit. I called the call center to clarify why I have to pay this. They told me it's because I'm a foreigner.
I said how the system even knows I'm a foreigner, it didn't ask me any questions. Then they said OK, send your documents over and we'll see.
Then I sent my documents - passport, permanent residence permit. (Already ridiculous effort for an internet connection)
They called me back saying that everything is fine, you don't need to pay 100 euros; we'll send you a contract, it will appear on your account in tet.lv website.
I said OK and waited.
After 3 days I receive an email saying
"We are working hard to get you on the new service as soon as possible, but in order for us to continue processing your application, you must pay a safety deposit and confirm the contract(s)" and a bill for 100 euros.
I will certainly never use any service from them and don't recommend to anyone.