Terminate my contract

I bought tablets from fonechoice last year some time in November. January/ February i called and advised them that the screens were damaged. The tablets were only collected in March after continuous calling, up to date I have NOT received proper feed back of what is happening. i keep calling no -one seems to be listening or willing to assist. i will be taking this matter further to the ombudsman and the NCA. PLEASE ! terminate my contract and keep your goods. The debit order is still running but i will be stopping it this month. i have paid almost a year for something i used for only two months is that fair ? your service is very poor and you do not care about your customers although i keep getting calls from your sales department on a daily basis. kindly advise once the contract is terminated!!!