There may come a time when you need to switch to a different marketing company. This could be for a number of reasons such as your current one is closing down, you are not happy with their service or you have been tempted to move by an offer the new company has on. If you do a fair amount of marketing then this is a decision that should not be taken lightly. You need to think carefully about how this may impact your online presence and what options you have should it not work out.
You need to find out how much of your current marketing can switch over to the new company without disruption. For example, if you have a Google Adwords campaign running then you may find that it has to be set up from scratch with the new company. You may be able to get the database fot he keywords and ads etc extracted from the previous marketing company but you will lose all the historical data.
If you have already moved to a new company but are not happy with their service and cannot rectify the situation then you may have to go back to your old company and see if they would be prepared to take you back on as a client.