It looks like a scam – they mentioned suspicious activity, and I doubt TSB would call from an EE mobile number.
Bank Scam Alert! - +44 7415 516959 (07415 516959)
概要 — +447415516959
専門家の見解
Reports indicate these calls often involve claims of suspicious activity on accounts, raising doubts about legitimacy when using a mobile number. Such tactics are typical of scammers impersonating banks like TSB to extract personal details. Hang up immediately if you receive unsolicited calls like this—never share information or click links provided. Contact your bank directly via their official number to verify any concerns. Enable call blocking on your phone and report suspicious numbers to authorities like Action Fraud. Stay vigilant to protect your data and finances from these fraudulent schemes.