Free Traffic Legal Advice

I have recently had an issue with an unpaid debt for a Mersey flow crossing from last August. All the correspondence went to my old address, and I did not know anything about it until I had a bailiff contact me on WhatsApp. I spoke to the bailiff, who was from Marston's Ltd, and explained that I had not had any correspondence, and it had gone to my old address. This was my fault as I had not changed the logbook for my car, however upon contacting Mersey flow, they asked me to contact the TEC and send a TE7 and TE9 form, which I did. In the meantime the bailiff was harassing me for the debt and I eventually arranged to pay him £150 and then a further £231 the following week. In between these times, I contacted Stepchange and they gave me 60 days breathing space. During the breathing space I received a revised fine and the creditor has asked me to pay the £20 original fine plus the crossing fee and that would be the end of it and I have now paid this.  I now want to claim the £150 back from Marston's as the fine has now been revoked by the creditor. Does anyone know how I go about this?

Furthermore, I have also read that the bailff should have never demanded or taken any money from me as the warrant had my old address on and therefore invalid. A new warrant should have been issued when he knew that I had moved, and he should have given me 7 clear days before contacting me.

I just want to know who I can claim from and who I can complain to. I have contacted Merseyflow twice and had no response. I have also contacted Marston's who tell me I have to contact Mersey flow because until they hear from them the fine is still outstanding?

Should I contact Halton Borough council instead?