Very angry

These people harass me at work. Send me constant messages saying I owe Nashua Mobile money, when I do not. Since when? They send me messages non stop threatening to give me a bad credit score. You use my ****en surname Green that I haven't used in almost 15 years, I never open accounts in my ****en surname as that is not my surname. I highly suggest you tell your customer Nashua Mobile to stop harassing me as well as Nimble group or I will take it further. I try contact customer services, I hold for over 20 minutes some times I don't get through to anyone or call centre puts the phone down on me. Stop harassing me! I owe them nothing