Is it possible to link for the second time?

I keep on updating my request regarding my concern the past few days but supercell has no response about it. my concern is I bought a new phone to someone online and forgot to reset it and accidentally link my COC account on his game center account logged to the iphone4 which I bought. eirlier the following day I tried resetting the phone after that I forgot that linking can only be done once, which made me worry because my account is linked to the game center account of the original owner of the phone. I think ##Lawrence## something like that is the game center account name that keeps on appearing every time I log in to COC the day I bought the phone. the following day I after resetting my new phone I forgot that linking can only be done once :( I want to play my coc here on my iphone :( all I need is the linking code if its possible to have a another one. I also want to unlink my account to the 1st owner of my phone because I think its possible that he will try to access my account because I tried reaching him the following day asking for his game center account so that I can still play my coc account even its his game center account. He keeps on ignoring my messages one reason I worried. I also given enough information to supercell but still has no response regarding my concern. I need to link my account here on my iphone so that I can play anywhere. I can still access my account through Samsung tab but samsung tab is much bigger and hassle to bring compared to iphone. I need your response supercell please check my messages through COC I've been sending a lot of screenshots, I even filled out everything that you ask me so please do something. :(

Village: -AllEyesOnMe
Village Level: Lvl 50
Clan: Rearmed
Clan Level: 5
Country: Philippines