I had ported my number from another provider to O2 in Schwandorf. The tariff I applied for was O2 unlimited Basic (under 29 tariff for young people) but I got O2 unlimited Smart. So now I'm paying €32.99, which is not I opted. I went to the store where I bought the sim several times and they told me it wasn't possible to change the contract. The problem is that my contract says O2 unlimited Smart, but I never applied for. Please tell me how I can change the contract to O2 unlimited Basic. Besides, this has been going on for more than 6 months.
Thank you!