I can't read Romanian, but many years ago I reported a pizza restaurant to the British equivalent for a similar problem — I was being sent texts every day, and STOP and replying hadn't stopped the messages.
They wrote to the restaurant, the texts stopped, and I had a follow-up email from the data protection agency.
An ombudsman is a great route for any telco-related complaints, during my time at least they were flagged with the same (or higher) priority than vip-effecting issues.
They wrote to the restaurant, the texts stopped, and I had a follow-up email from the data protection agency.