Lump sum not been paid to me

Hi. I would be so grateful for any advice. I was awarded a lump sum and a PSO. Lump sum to be paid 56 days after PSO implementation which should have been in June this year. I paid my pso fees in February. My ex didn't pay his half of the pso fees until August. I wrote many emails to the pension people who gave various reasons for the delay such as they were trying to find his fee payment on their system. Also saying delays because of the McCloud judgement. They eventually said there'd been some confusion as they thought it was paid in April but it was paid in August. They implemented the pso then which meant the lump sum should have been paid mid October but it still hasn't been paid. I have been asking my solicitor what I can do but I'm not getting very far as they don't always reply and still haven't told me what I do. I asked what form to fill in for court and if I fill it in or if the solicitors do. Im worried that my ex will just move somewhere without paying me. I've struggling financially and it costs each time I email the solicitors. Please could anyone tell me what I can do? Many thanks