Poor Service

I have bought 4 curtains from homechoice and on friday 16/08/2019 i've gone to collected point to collect my curtain i've only reveive 2 bedrooms curtains, so send them email to tell them that i didnt receive my lounge curtain, they said ive collected them on 19th August 2019 but that day i was at work i didn't receive any package. So i told them to send me a picture of signatures but they dint do that, they told me to fill dispute forms and i did but nothing is happening until now but they debit every month. what can i do with this situation help me