Amazon dsp not paying me and isn’t answering my messages (England)

Recently I was sacked by my Amazon dsp because of sick days and the owner deducted £200 for van damages which didn’t happen but I left it as it’s not worth the hassle of trying to get £200 back but now my last week pay hasn’t been sent to me, I had a payslip yesterday but nothing has been put in my bank and he is ignoring my messages.

On my contract it says I can be terminated without further payment if I breach the agreement seriously or repeatedly but I don’t think I have done that. Is there anything I can do?